ChatGPT answers, unedited

If SEO + fast page loads + structured data are your top priorities, I’d shortlist these:

🥇 My pick: Saleor

If you're comfortable with a modern developer stack, Saleor is probably the strongest choice for your priorities. It's an API-only, headless platform, so you can build the storefront with something like Next.js and control exactly what gets delivered to the browser. Its open-source core specifically describes itself as a high-performance, composable headless commerce API. github.com

Saleor also has built-in SEO functionality including sitemaps, robots controls, and JSON-LD structured data on product and homepage pages. saleor-fork.readthedocs.io

The important caveat: Saleor doesn't automatically make your storefront fast. Your frontend architecture, image optimization, caching/CDN strategy, JavaScript bundle size, and server rendering will determine the actual Core Web Vitals.

🥈 Shopware if you want more out of the box

I'd choose Shopware if you want strong SEO/performance capabilities without building as much of the commerce experience yourself.

Its current platform includes SEO URLs, metadata, XML sitemaps, hreflang, canonical handling, HTTP caching, lazy-loaded images and image optimization. www.shopware.comdevelopers.google.com

It's also actively maintained—the current documentation shows Shopware 6.7 releases in 2026. developer.shopware.com

🥉 PrestaShop

PrestaShop is worth considering if you want a more traditional PHP ecommerce system. PrestaShop 9 modernized the stack around Symfony 6.4/PHP 8.1+ and added improved SEO controls. saleor-fork.readthedocs.ioprestashop.com

It supports friendly URLs, canonicals, redirects and robots.txt controls, although I'd expect to spend more effort optimizing the theme/modules than with a carefully built Saleor/Next.js storefront. docs.prestashop-project.org

Bottom line:

• Maximum performance + technical SEO control: Saleor + Next.js
• Best balance of built-in ecommerce + SEO/performance: Shopware
• Simpler traditional self-hosted approach: PrestaShop

One particularly important point: don't choose based solely on whether a platform supports schema markup. Google recommends relevant ecommerce structured data, but structured data itself isn't a direct ranking boost; it primarily helps Google understand products and can make pages eligible for richer search appearances. developers.google.com

If you tell me your catalog size, expected monthly traffic, and whether you want a headless frontend, I can narrow this down to the best architecture for you.

If SEO + fast page loads + structured data are your top priorities, I’d narrow the open-source field to PrestaShop, WooCommerce, and a headless platform such as Sylius/Medusa.

My ranking

*Usually achieved through an SEO package or your own frontend implementation rather than being the core platform's strongest out-of-the-box feature.

🥇 I'd pick PrestaShop 9 for most stores

PrestaShop 9 has made some particularly relevant SEO/performance improvements: cleaner product URLs, better handling of indexation, and native WebP/AVIF support. PrestaShop Project

Its upcoming/current Hummingbird theme is also explicitly designed around Core Web Vitals and includes JSON-LD structured data. PrestaShop Project

That's a compelling combination if you want a normal, self-hosted ecommerce site rather than building a custom frontend.

🥈 WooCommerce if organic content is a major strategy

WooCommerce's big advantage isn't necessarily raw platform performance—it's the WordPress SEO ecosystem. You get an extremely mature CMS for category content, buying guides, blogs, landing pages, etc., alongside enormous plugin availability.

The catch is that performance can deteriorate badly with bloated themes/plugins. A lightweight theme, good hosting, full-page caching, CDN, optimized images, and careful plugin selection are essential. Open Source Groups

If SEO means "I want to publish lots of content and build topical authority," I'd seriously consider WooCommerce.

🥇 for maximum technical performance: Sylius + fast frontend

If you're comfortable with developers, Sylius is more interesting. It's an open-source, API-oriented ecommerce framework built on Symfony, rather than a giant monolithic storefront. GitHub

There's also a Sylius SEO plugin that automatically generates Schema.org JSON-LD for products/product groups, offers, the online store and website. GitHub

That makes a stack such as:

Sylius → Next.js → CDN/edge caching

very attractive when you care about squeezing Core Web Vitals and technical SEO performance.

The downside: you're building more of the system yourself.

One important distinction

Don't choose an ecommerce platform based solely on its built-in structured data. Structured data is relatively easy to add. Architecture and rendering strategy have a much bigger effect on page speed.

For example, a well-built headless storefront can generate product/category pages statically or with incremental regeneration and serve them from a CDN. In that setup, the frontend architecture largely determines what Google and users experience. WPBundle

So my recommendation would be:

• Want the best balance with minimal engineering: PrestaShop 9
• Want SEO/content marketing + huge ecosystem: WooCommerce
• Want maximum control/performance and have developers: Sylius + Next.js
• Want a modern TypeScript/headless stack: Medusa + Next.js

If you tell me roughly number of products, expected monthly traffic, and whether you're comfortable with a headless setup, I can recommend the architecture I'd use specifically for 90+ Lighthouse scores and strong Google product/category SEO.

*Usually achieved through an SEO package or your own frontend implementation rather than being the core platform's strongest out-of-the-box feature.

🥇 I'd pick PrestaShop 9 for most stores

PrestaShop 9 has made some particularly relevant SEO/performance improvements: cleaner product URLs, better handling of indexation, and native WebP/AVIF support. PrestaShop Project

Its upcoming/current Hummingbird theme is also explicitly designed around Core Web Vitals and includes JSON-LD structured data. PrestaShop Project

That's a compelling combination if you want a normal, self-hosted ecommerce site rather than building a custom frontend.

🥈 WooCommerce if organic content is a major strategy

WooCommerce's big advantage isn't necessarily raw platform performance—it's the WordPress SEO ecosystem. You get an extremely mature CMS for category content, buying guides, blogs, landing pages, etc., alongside enormous plugin availability.

The catch is that performance can deteriorate badly with bloated themes/plugins. A lightweight theme, good hosting, full-page caching, CDN, optimized images, and careful plugin selection are essential. Open Source Groups

If SEO means "I want to publish lots of content and build topical authority," I'd seriously consider WooCommerce.

🥇 for maximum technical performance: Sylius + fast frontend

If you're comfortable with developers, Sylius is more interesting. It's an open-source, API-oriented ecommerce framework built on Symfony, rather than a giant monolithic storefront. GitHub

There's also a Sylius SEO plugin that automatically generates Schema.org JSON-LD for products/product groups, offers, the online store and website. GitHub

That makes a stack such as:

Sylius → Next.js → CDN/edge caching

very attractive when you care about squeezing Core Web Vitals and technical SEO performance.

The downside: you're building more of the system yourself.

One important distinction

Don't choose an ecommerce platform based solely on its built-in structured data. Structured data is relatively easy to add. Architecture and rendering strategy have a much bigger effect on page speed.

For example, a well-built headless storefront can generate product/category pages statically or with incremental regeneration and serve them from a CDN. In that setup, the frontend architecture largely determines what Google and users experience.

So my recommendation would be:

If SEO + fast page loads are your top priorities, I’d shortlist Saleor and Medusa, with Saleor as my first choice if structured data and technical SEO are especially important.

🥇 Saleor

Saleor is probably the strongest fit for what you're describing.

It's a headless, GraphQL-first commerce platform, so you can pair it with Next.js and control exactly how product/category pages are rendered, cached, and delivered. Saleor itself describes its core as a "high performance, composable, headless commerce API." github.com

Its SEO capabilities include sitemaps, robots directives, meta descriptions, and JSON-LD structured data for products and the homepage. saleor-fork.readthedocs.io

The current open-source Next.js storefront also uses aggressive caching and streaming techniques for catalog pages, with cached product/category shells and dynamic portions streamed separately. github.com

Saleor official site

🥈 Medusa

Medusa is an excellent alternative if your team is heavily invested in TypeScript/Node.js.

The important distinction is that Medusa is primarily your commerce backend. I'd pair it with Next.js, where you control:

• SSR/SSG/ISR
• Core Web Vitals
• canonical URLs
• metadata
• JSON-LD
• sitemap generation
• image optimization
• caching/CDN
• internal linking

That architecture can be extremely fast. The downside is that you'll generally assemble more of the SEO/content layer yourself than with WordPress/WooCommerce.

🥉 WooCommerce

WooCommerce is the choice I'd make if content-driven SEO is just as important as storefront performance.

WordPress gives you an enormous SEO/content ecosystem, but a conventional WooCommerce theme can become slow because of plugins, PHP rendering, scripts, and bloated themes. A headless WooCommerce + Next.js setup largely eliminates that frontend problem. www.wpbundle.comwww.wpbundle.com

WooCommerce official site

What I'd build

If I were optimizing specifically for organic traffic + Core Web Vitals + rich results, I'd lean toward:

Saleor → Next.js → CDN/edge caching → JSON-LD → Google Merchant Center

The key point is that the ecommerce backend isn't what determines most of your page-load performance. Your storefront architecture, rendering strategy, JavaScript payload, image handling, caching, and CDN matter enormously. www.wpbundle.comwww.wpbundle.com

For SEO, I'd make sure every product page outputs Product/Offer structured data, category pages have crawlable links, canonical URLs are correct, XML sitemaps are automatically generated, and the initial HTML contains the important product content rather than requiring client-side JavaScript.

My ranking for your priorities:

1. Saleor + Next.js — best overall technical SEO/performance combination
2. Medusa + Next.js — best if you're a TypeScript-first development team
3. WooCommerce + Next.js — best if blogging/content SEO and plugins are critical
4. Magento Open Source — powerful, but I'd avoid its complexity unless you genuinely need it

If you're starting from scratch, I'd pick Saleor + Next.js.

If SEO + fast page loads + structured data are your top priorities, I’d shortlist Shopware, WooCommerce, and Magento Open Source—but my first choice for a performance-focused custom build would be Shopware.

My ranking

*WooCommerce's structured-data capabilities are excellent, but you'll commonly rely on SEO plugins/extensions for the richer implementation. SwingIntel MGT Commerce

🥇 Shopware would be my pick

Shopware has a particularly good architecture if you're willing to have developers involved.

It gives you control over SEO URLs and other technical SEO settings, while its API-first architecture makes it suitable for a custom/headless frontend if you want maximum control over HTML, JavaScript, caching, and Core Web Vitals. Shopware Docs OpenReplay Blog

Shopware also documents performance strategies around Redis, Elasticsearch/OpenSearch, database optimization, and scalable infrastructure. Shopware Docs

The important distinction is that the platform doesn't magically make a site fast. A well-built Shopware installation can be extremely fast; a poorly configured one can still be slow.

🥈 WooCommerce if SEO/content is your superpower

WooCommerce is probably the strongest choice if your business depends heavily on content + commerce.

Because it's built on WordPress, you get an enormous SEO ecosystem and very flexible control over titles, canonicals, schema, internal linking, landing pages, blogs, etc. Datafirefly Open Source Groups

The catch is performance discipline. Plugins, themes, page builders, third-party scripts, and database configuration can easily turn a WooCommerce site into a slow site. That's particularly relevant as catalogs become large. Datafirefly

I'd choose WooCommerce when SEO content marketing is as important as the store itself.

🥉 Magento Open Source for huge catalogs

Magento is the option I'd consider for something like 50,000–500,000+ products, complicated catalogs, multiple stores, or sophisticated B2B requirements.

It has tremendous control over the underlying HTML, URLs, caching and infrastructure, but you're accepting substantially more development and infrastructure complexity. Current comparisons generally put Magento in the enterprise/large-catalog category rather than the easy-to-operate category. Open Source Groups MGT Commerce

One important SEO point

Don't choose a platform solely because it says it has "structured data."

For ecommerce SEO, I'd want the implementation to produce clean, valid JSON-LD for at least:

• Product
• Offer
• AggregateRating / Review where legitimately applicable
• BreadcrumbList
• Organization
• WebSite
• relevant ItemList/category markup
• variant information where applicable

And I'd want server-rendered product content, clean canonical URLs, XML sitemaps, sensible faceted-navigation handling, control over robots.txt, redirects, pagination, hreflang if needed, and minimal JavaScript blocking the initial render.

In other words, HTML architecture and Core Web Vitals matter more than which platform has the longest SEO feature checklist. Web Solutions NYC

My recommendation

If I were starting today:

Shopware + server-rendered storefront + aggressive full-page/HTTP caching + CDN + optimized images + carefully implemented JSON-LD

would be my default for a serious SEO-first ecommerce project.

If the site is small/medium and heavily content-driven, I'd instead lean WooCommerce.

If you tell me roughly number of products, expected monthly traffic, whether you need a blog/content strategy, and whether you're comfortable running your own server, I can narrow this down to the best architecture—and compare Shopware vs WooCommerce vs Magento specifically for Core Web Vitals and Google structured data.

Because it's built on WordPress, you get an enormous SEO ecosystem and very flexible control over titles, canonicals, schema, internal linking, landing pages, blogs, etc. Datafirefly Open Source Groups

The catch is performance discipline. Plugins, themes, page builders, third-party scripts, and database configuration can easily turn a WooCommerce site into a slow site. That's particularly relevant as catalogs become large. Datafirefly

I'd choose WooCommerce when SEO content marketing is as important as the store itself.

🥉 Magento Open Source for huge catalogs

Magento is the option I'd consider for something like 50,000–500,000+ products, complicated catalogs, multiple stores, or sophisticated B2B requirements.

It has tremendous control over the underlying HTML, URLs, caching and infrastructure, but you're accepting substantially more development and infrastructure complexity. Current comparisons generally put Magento in the enterprise/large-catalog category rather than the easy-to-operate category.

One important SEO point

Don't choose a platform solely because it says it has "structured data."

If SEO + fast page loads + structured data are your top priorities, I’d put Shopware 6 at the top of the open-source shortlist.

🥇 Shopware 6

Shopware has a particularly strong combination of native caching, image optimization, SEO URL controls, canonicals, hreflang, sitemaps and metadata. Its HTTP cache can serve already-rendered pages rather than rebuilding them for every request, and its documentation explicitly recommends HTTP caching for production. github.comdocs.shopware.com

For SEO, you can control product/category URL structures, redirects and canonical URLs directly. github.comdocs.shopware.com Shopware also documents structured-data/Schema.org support, while its ecosystem has JSON-LD extensions when you need richer Product, Offer, shipping, returns, etc. markup. store.shopware.com

Shopware documentation

🥈 Sylius — if you have a strong development team

Sylius is arguably more attractive if you're building a highly customized storefront rather than wanting lots of ecommerce functionality out of the box.

Its FrontWing storefront uses Remix SSR, code splitting, lazy loading, image optimization and minimal JavaScript for unauthenticated users—an excellent architecture for Core Web Vitals. docs.sylius.com

The catch is that some SEO functionality is more DIY. For example, the popular Sylius SEO plugin adds Schema.org JSON-LD for products, ProductGroup, offers, etc. github.com

So I'd choose Sylius + a modern SSR frontend if technical performance is more important than having everything packaged into the ecommerce platform.

What I'd choose

• Want the best balance of SEO, speed, ecommerce features and manageable development: Shopware 6
• Have experienced developers and want maximum frontend control: Sylius
• Want a conventional PHP ecommerce platform with a large ecosystem: PrestaShop
• Content/SEO publishing is as important as ecommerce: WooCommerce, provided you're disciplined about plugins and frontend bloat.

One important caveat: the platform alone doesn't determine page speed. A poorly built Shopware theme can be slower than a carefully engineered Sylius store. For SEO, I'd specifically prioritize SSR/HTML-first rendering, aggressive caching, WebP/AVIF responsive images, minimal JavaScript, clean canonicals, XML sitemaps, breadcrumbs, and complete Product/Offer/Breadcrumb JSON-LD.

If you tell me roughly how many products/SKUs you expect and whether you're comfortable with PHP/React, I can narrow this down to the best architecture for your store.

If SEO and page speed are top priorities, I would generally avoid choosing an ecommerce platform only by “features.” The architecture (server rendering, caching, frontend control, clean URLs, schema markup, and Core Web Vitals) matters more. webmedic.com

My shortlist:

opensourceprojects.cc

My picks by SEO/performance priority

1. Best technical SEO + fastest possible storefront: Medusa + Next.js

• Headless architecture lets you build with modern frameworks like Next.js.
• You control:
  • server-side rendering
  • image optimization
  • Core Web Vitals
  • caching strategy
  • structured data templates
  • clean URL routing
• Product schema, breadcrumbs, and category markup can be generated exactly how you want.
• Tradeoff: you need developers; it is not a plug-and-play store. opensourceprojects.cc

2. Best SEO ecosystem: WooCommerce

• WordPress gives you a huge advantage for organic traffic:
  • blogging
  • landing pages
  • internal linking
  • SEO plugins
  • content workflows
• You can add structured data through plugins or custom code.
• The downside is that poorly configured plugins/themes can destroy performance. A lean WooCommerce stack with good hosting, caching, and optimized images can be very fast. ecomm.design

3. Best for very large catalogs: Magento Open Source

• Strong control over:
  • canonical URLs
  • layered navigation
  • sitemaps
  • schema customization
  • complex catalogs
• Needs serious hosting and optimization. The default frontend is heavier, so many performance-focused Magento stores use alternative themes/frontends. www.velsof.com

What I would avoid if SEO speed is the main goal

• Heavy all-in-one themes with lots of JavaScript.
• Dozens of SEO/performance plugins stacked together.
• Client-side-only rendered product pages without proper server rendering.
• Platforms where you cannot control structured data output.

A high-performance SEO stack I would consider:

Option A (modern):

• Medusa backend
• Next.js storefront
• PostgreSQL
• CDN
• Automated JSON-LD product schema
• Static generation for category pages

Option B (content-first):

• WooCommerce
• Lightweight custom theme
• Managed WordPress hosting
• Object caching (Redis)
• Minimal plugins
• Custom schema templates

If your goal is ranking product pages on Google and getting sub-second loads, I would lean Medusa + Next.js for a new build, or WooCommerce with a custom lightweight frontend if content marketing is a major acquisition channel.

If SEO + fast page loads + structured data are your priorities, my first choice would be Shopware 6.

My ranking

\*Usually depends heavily on plugins such as Yoast/Rank Math and how well the WordPress stack is optimized.

Why I'd pick Shopware: it has built-in HTTP caching, lazy-loading, responsive image delivery, and ongoing Core Web Vitals improvements. Its SEO system also gives you control over SEO URLs, metadata, multilingual/hreflang configuration, etc. www.shopware.com

For structured data specifically, Shopware supports Schema.org markup, although for a serious SEO implementation I'd still audit and customize the generated Product, Offer, BreadcrumbList, Organization, and potentially FAQ schema rather than blindly trusting defaults. docs.shopware.com

Magento Open Source is arguably stronger if you're building a very large catalog or complex multi-store setup. Its SEO tooling includes canonical URLs, sitemaps, metadata, and built-in Schema.org structured data on product templates. experienceleague.adobe.com The downside is that Magento is considerably more demanding to host and optimize.

The important caveat

The platform alone won't determine your Core Web Vitals. A badly configured Shopware store with 50 extensions, enormous images and third-party scripts can be slower than a carefully optimized WooCommerce installation.

If I were starting from scratch specifically for organic search, I'd choose:

Shopware 6 + server-side rendering + aggressive HTTP/page caching + WebP/AVIF + CDN + minimal JavaScript + carefully validated Schema.org markup.

If you tell me your approximate catalog size (e.g. 500 vs 100,000 products), monthly traffic, and whether you need B2B/multistore, I can narrow this down to Shopware vs Magento vs WooCommerce for your particular case.

If SEO + fast page loads + structured data are your top priorities, I’d put Shopware 6 at the top of the open-source shortlist.

My pick: Shopware 6

Shopware

Why it fits your priorities:

• Performance: Shopware has built-in HTTP caching, cache warming, lazy image loading, and image optimization. Its recent releases have also focused specifically on storefront loading times and Core Web Vitals. www.shopware.com
• Technical SEO: You get configurable SEO URLs, canonical URLs, redirects, hreflang support, and control over indexing. docs.shopware.com
• Structured data: The current Shopware 6.8 direction is particularly attractive here: its storefront uses JSON-LD structured data rather than the older inline microdata approach. github.com
• Scalability: It is a better fit than many lightweight platforms if you're expecting a large catalog, lots of variants, multiple languages, or substantial traffic.
• Open source: You can self-host and customize the core/storefront rather than being locked into a SaaS platform.

How I'd rank the main options

One important caveat: the platform alone won't determine Core Web Vitals. A poorly built Shopware theme with 30 plugins and huge JavaScript bundles can be slower than a carefully optimized PrestaShop store.

If I were building an SEO-first store today, I'd choose Shopware 6 + a lean custom storefront/theme + aggressive caching/CDN + minimal third-party JavaScript. Shopware's current architecture also makes JSON-LD a particularly good fit for your structured-data requirement. www.shopware.comgithub.com

If you tell me roughly how many products/variants you have and whether you're doing B2C, B2B, or both, I can give you a more specific Shopware vs. PrestaShop vs. Magento recommendation.

If SEO + fast page loads are your top priorities, I’d narrow it to Saleor, Medusa, and WooCommerce, with a strong preference for a headless architecture.

My pick: Saleor

Saleor is probably the best fit if you have a technical team and want maximum control over performance and SEO.

• Headless/API-first: your storefront can be built with Next.js, giving you control over SSR/SSG, caching, CDN delivery, image optimization, and Core Web Vitals.
• SEO-friendly: Saleor explicitly supports SEO through its headless architecture, and its ecosystem includes a Next.js storefront. github.comsaleor-fork.readthedocs.io
• Structured data: product pages can expose JSON-LD/semantic product information, including things like price and availability. github.comsaleor-fork.readthedocs.io
• GraphQL: useful for requesting only the product data your frontend actually needs.
• Scales well: PostgreSQL-based architecture and a composable design make it attractive for larger catalogs. www.wpbundle.comwww.wpbundle.com

Runner-up: Medusa

Medusa is excellent if your team is primarily TypeScript/Node.js/React.

Its biggest advantage is that it was designed as a headless commerce backend from the beginning. Pair it with Next.js and you can build an extremely lean storefront. www.wpbundle.com

The catch: SEO and structured data are more of a frontend responsibility. That's not necessarily bad—in fact, it gives you tremendous control—but you'll need to implement things like JSON-LD, canonical URLs, metadata, sitemaps, breadcrumbs, etc.

WooCommerce: best if content SEO matters most

WooCommerce is the pragmatic choice if you're heavily invested in content marketing, blogging, landing pages, and WordPress SEO.

The problem is that a conventional WooCommerce theme can become slow. A headless WooCommerce + Next.js setup largely eliminates that frontend problem, while retaining WordPress's mature CMS ecosystem. www.wpbundle.comwww.wpbundle.com

How I'd rank them for your priorities

One important caveat: the ecommerce backend isn't what primarily determines page speed. With a headless setup, your frontend architecture, rendering strategy, caching/CDN, JavaScript payload, images, fonts, and third-party scripts will have a much larger impact on Core Web Vitals. www.wpbundle.comwww.wpbundle.com

So if I were starting an SEO-first store today, I'd seriously consider:

Saleor → Next.js → CDN/edge caching → JSON-LD → server-rendered product/category pages → aggressive image optimization

That gives you a very high ceiling for both Google SEO and sub-second storefront performance.

If SEO + fast page loads are your top priorities, I’d shortlist Saleor, Medusa, and Shopware—but my first choice would be Saleor if you’re comfortable with a headless stack.

My ranking

1. Saleor — best for performance-first headless

• API-only, headless architecture with GraphQL.
• Designed to pair with modern React/Next.js storefronts, so you can use SSR/SSG, caching, CDN/edge delivery, and image optimization aggressively. github.com
• Has strong SEO flexibility, and its SEO documentation specifically describes JSON-LD structured data for homepage and product pages. saleor-fork.readthedocs.io
• Particularly attractive if you have developers who can manage React/Next.js + Python/GraphQL.

2. Shopware — best if you want more built-in ecommerce SEO

• More traditional/full-featured than Saleor, with extensive SEO URL configuration. docs.shopware.com
• Its own SEO guidance emphasizes Core Web Vitals, fast loading, crawl efficiency, and Schema.org structured data. www.shopware.com
• Has substantial performance tooling around caching, Redis, OpenSearch/Elasticsearch, PHP-FPM, etc. docs.shopware.com
• I'd choose it if you want SEO functionality closer to the box, rather than assembling everything around a headless backend.

3. Medusa — excellent for a custom modern stack

• TypeScript/Node.js and headless from the ground up. github.com
• Very good fit for a Next.js storefront where you control exactly how pages are rendered and cached.
• The downside for SEO is that you'll generally build more of the SEO/content layer yourself than with Shopware or WordPress/WooCommerce.

The important distinction

For page speed, the ecommerce backend isn't necessarily the deciding factor. Your storefront architecture matters enormously.

A stack like:

Saleor → Next.js → CDN/edge → optimized images + aggressive caching

can be extremely fast because product pages can be statically generated/cached while dynamic cart and checkout functionality remains server-side.

For structured data, I would also avoid choosing a platform solely because it "supports Schema.org." What's more important is whether you can cleanly control the JSON-LD on product, category, breadcrumb, organization, and other pages without plugins fighting you.

My recommendation:
If you're building from scratch and have a technical team, Saleor + Next.js is probably the strongest fit for your priorities. If you want a more complete ecommerce system with stronger built-in SEO controls and less custom assembly, Shopware is arguably the safer choice.

If you tell me your catalog size, whether you're using Next.js, and whether you need a CMS/blog, I can narrow it down between Saleor, Shopware, Medusa, and WooCommerce specifically for Core Web Vitals + Google rich results.

If SEO and page speed are your top priorities, I would focus less on the platform’s marketing claims and more on how much control you get over HTML output, caching, URLs, schema markup, and server rendering. The strongest open-source choices are usually:

www.datafirefly.comwww.ynvar.comwww.mgt-commerce.comswingintel.com

My ranking for an SEO-first, speed-first store

1. Shopware — best overall balance

• Modern architecture (Symfony-based), good API/headless options.
• Strong defaults for clean URLs, content management, and structured commerce data.
• Easier to keep fast than heavier platforms when configured well.
• Good choice if you expect a large catalog or want a custom frontend. www.ynvar.comwww.mgt-commerce.com

2. Magento Open Source — highest ceiling

• Probably the most technically powerful if you have developers.
• Excellent control over:
  • canonical URLs
  • XML sitemaps
  • robots rules
  • product/category metadata
  • custom JSON-LD schema
• Can be extremely fast with proper Varnish/CDN/cache architecture, but poor configurations can become slow. www.ynvar.comwww.mgt-commerce.com

3. WooCommerce — best if SEO content drives sales

• WordPress gives you unmatched blogging/content SEO capability.
• Plugins such as Yoast SEO or Rank Math make schema and metadata management easy.
• The risk: too many plugins, page builders, or poorly optimized themes can hurt Core Web Vitals. swingintel.comwww.datafirefly.com

4. PrestaShop — underrated option

• Good native multilingual support and solid SEO controls.
• Often a good fit for international stores.
• Less ideal if you want a highly custom headless frontend. swingintel.comwww.datafirefly.com

For structured data specifically, look for:

• Product schema:
  • Product
  • Offer
  • AggregateRating
  • Review
• Navigation:
  • BreadcrumbList
• Brand/entity:
  • Organization
• Content:
  • Article
  • FAQPage (where appropriate)

A platform that lets you edit templates and inject JSON-LD cleanly is usually better than one that generates schema you cannot control.

Performance stack matters more than the platform

A fast SEO ecommerce site usually needs:

• CDN (Cloudflare/Fastly/etc.)
• HTTP/3
• server-side rendering
• image optimization (WebP/AVIF)
• aggressive caching
• optimized database indexes
• minimal JavaScript
• clean theme/templates

Practical recommendation

• <5,000 products + lots of blog/content SEO: WooCommerce
• 5,000–100,000+ products + SEO + speed focus: Shopware or Magento
• International/multi-language: Shopware or PrestaShop
• Developer team building a custom frontend: Shopware, Magento, or a headless platform

If your goal is maximum Google rankings + fastest possible storefront, I’d probably shortlist Shopware first, Magento second, WooCommerce third. The winner depends heavily on your catalog size and whether you have developers maintaining the stack. swingintel.com

If SEO + fast page loads + structured data are your top priorities, my first choice would be Shopware 6, with Medusa as the better option if you're comfortable building a custom headless frontend.

My ranking

\*With Medusa, you largely control the structured-data implementation through your frontend rather than relying on the commerce backend.

🥇 Shopware 6 — best balance

Shopware is probably the sweet spot if you want an open-source platform without having to engineer the entire storefront yourself.

It has native SEO URL configuration, canonical controls, redirects, multilingual SEO features, caching/indexing, and performance optimizations. Shopware specifically documents its HTTP cache, image lazy loading, image optimization and Core Web Vitals work. docs.shopware.com

One particularly important advantage: you can keep the storefront relatively clean rather than accumulating dozens of WordPress plugins. That's useful when you're obsessive about LCP, CLS, INP, crawlability and HTML quality.

Shopware documentation

🥈 Medusa — potentially fastest

If you're technical and willing to use something like Next.js + Medusa, I'd seriously consider Medusa.

The architecture gives you much more control over what gets rendered, cached and sent to the browser. Medusa's own production guidance emphasizes rendering strategy, caching, minimizing API payloads, lazy loading, code splitting and CDNs. docs.medusajs.com

For an SEO-first custom storefront, you could generate:

• Product Product schema
• Offer / pricing / availability
• AggregateRating
• BreadcrumbList
• Organization
• WebSite
• Article/BlogPosting
• Collection/category markup
• Open Graph/Twitter metadata
• Canonicals
• XML/HTML sitemaps

That gives you excellent control over the final HTML Google actually sees.

The downside is that Medusa doesn't magically give you a polished SEO storefront—you or your development team have to build it correctly.

🥉 WooCommerce — easiest SEO ecosystem

WooCommerce is still compelling if your content strategy is heavily WordPress-based.

You have enormous flexibility with SEO plugins and structured data, but there's a catch: WooCommerce itself isn't what makes the site fast. Your theme, plugins, database, hosting, images and caching architecture determine that.

A carefully engineered WooCommerce site can be extremely fast. A typical plugin-heavy WooCommerce site can be painfully slow.

Google explicitly notes that ecommerce platforms can use extensions/plugins to implement structured data, and that structured data helps Google better understand ecommerce content. developers.google.com

What I'd choose

If I were starting a new store today:

Normal/large ecommerce business → Shopware 6

Developer-led, performance-obsessed brand → Medusa + Next.js

Content-heavy business already invested in WordPress → WooCommerce

Huge enterprise catalog / complicated business rules → Magento Open Source

And I wouldn't choose based on "which platform has the best schema." The platform is only part of it. Google recommends structured data alongside good ecommerce site architecture, crawlable URLs, internal linking and other technical SEO practices. developers.google.com

If you tell me roughly how many products you expect (100 / 10k / 100k+), whether you need a blog, and whether you're comfortable with React/Next.js, I can narrow this down to the best architecture for sub-2-second loads + excellent Google rich-result/schema coverage.

If SEO + fast page loads + structured data are your top priorities, I’d put Shopware at the top of the open-source shortlist.

My ranking

Shopware has a particularly strong combination: modern Symfony architecture, HTTP caching, OpenSearch for catalogs, and API-first/headless capabilities. Its SEO tooling covers things like SEO URLs, metadata, canonicals and sitemaps, while its architecture gives you considerable control over the rendered HTML and schema. www.shopware.comwww.datafirefly.com

PrestaShop would be my second choice. It's particularly attractive if you're running multiple countries/languages because multilingual and multi-store functionality is strong. It can be very fast with good caching and hosting, though its module ecosystem needs more scrutiny because poorly implemented modules can hurt performance. www.datafirefly.com

WooCommerce is excellent if your SEO strategy is heavily content-driven. WordPress gives you enormous flexibility and plugins such as Yoast/Rank Math can handle sophisticated schema. The downside is that it's very easy to destroy performance with plugins, themes and inefficient queries. www.shopware.comwww.datafirefly.com

One important caveat

Don't choose purely based on which platform claims to have "built-in schema." Structured data is only useful when the actual HTML output is clean, accurate and consistent with the visible content. All of these platforms give you enough control to implement excellent Schema.org markup; the difference is how much work you need to do to get there. swingintel.com

If I were building a new store specifically around organic search + Core Web Vitals, I'd choose:

Shopware + server-side rendered storefront + aggressive HTTP/CDN caching + carefully controlled third-party extensions.

For a small store (<1,000 products), though, I'd seriously consider WooCommerce because its SEO/content ecosystem can outweigh Shopware's architectural advantages. For 10,000+ products, I'd lean much more strongly toward Shopware. www.shopware.comwww.datafirefly.com

If you tell me roughly how many products/SKUs you expect and whether you need a blog/content-heavy SEO strategy, I can narrow it down to the best 2–3 architectures for your situation.

If SEO + fast page loads + structured data are your priorities, I’d shortlist these:

My pick: Shopware

For your specific priorities, Shopware is probably the strongest starting point. Its SEO tooling includes customizable SEO URLs, canonicals, redirects, metadata, sitemaps and hreflang. It also has built-in HTTP caching, lazy loading and image optimization aimed at Core Web Vitals. www.shopware.com

It also has a particularly good path for structured data: Shopware's documentation and ecosystem support Schema.org/rich-snippet markup, including product-related data. docs.shopware.com

Shopware SEO documentation

If maximum frontend speed matters most: Medusa

I'd choose Medusa + Next.js if you're comfortable building a headless storefront. Medusa is headless-first, so you can control the HTML, rendering strategy, caching, images and JavaScript much more aggressively than with a traditional monolith. Its newer caching work reports roughly 2.2× faster core commerce APIs in its own benchmarks. medusajs.com

The catch: structured data and much of the technical SEO become your frontend's responsibility. That's not necessarily bad—it gives you maximum control—but it means more engineering.

Saleor

Saleor is another excellent headless option. Its architecture gives you considerable SEO freedom, and its documentation describes JSON-LD structured data on homepage and product pages, including product, price and availability information. github.com

Bottom line:

• Want the best combination of built-in SEO + performance: Shopware
• Want maximum control over speed/HTML and have a strong JS team: Medusa + Next.js
• Want GraphQL/headless and enterprise-oriented architecture: Saleor
• Want WordPress/content marketing to be a major part of the business: WooCommerce, ideally with a carefully optimized or headless frontend.

One important caveat: the platform alone doesn't determine page speed. A well-hosted WooCommerce site can beat a poorly implemented Medusa site. For SEO, I'd pay particular attention to Core Web Vitals, server-side rendering, HTML size, JavaScript hydration, image delivery, canonical URLs, XML sitemaps, breadcrumbs, and Product/Offer/BreadcrumbList JSON-LD.

If SEO + fast page loads are your top priorities, I’d shortlist Saleor, Medusa, and Shopware—but my first choice would be Saleor with a Next.js storefront.

🥇 Saleor — my pick for your priorities

Saleor is API-only and GraphQL-native, so you can keep the ecommerce backend completely separate from the customer-facing site. Its official open-source storefront is built with Next.js, React, TypeScript, GraphQL, and Tailwind, which gives you a very good foundation for Core Web Vitals and aggressive caching/CDN strategies. github.com

The SEO side is particularly attractive: Saleor supports SEO metadata, sitemaps, robots controls, and JSON-LD structured data for products and the homepage. saleor-fork.readthedocs.io

Saleor official site

🥈 Medusa — excellent if you're a JS/TS shop

Medusa is also headless-first and built around Node.js/TypeScript. That makes it particularly attractive if your team wants a Next.js + TypeScript + PostgreSQL stack and maximum control over rendering, caching, URLs, metadata, and structured data. www.wpbundle.com

The catch: compared with Saleor, you'll generally be doing more of the SEO/structured-data implementation yourself on the frontend. That's not necessarily bad—if SEO is critical, having complete control can actually be an advantage.

🥉 Shopware — strongest if you don't want to build everything

Shopware has more built-in traditional ecommerce functionality and increasingly strong structured-data support. Its current development direction includes JSON-LD schemas such as Product, ProductPage, Organization, WebSite, ItemList, and VideoObject. github.com

Shopware SEO documentation

What I'd actually build

If you're serious about organic search and speed, I'd prioritize the architecture over the ecommerce engine:

Saleor → GraphQL → Next.js → CDN/edge caching → optimized images → JSON-LD

That lets you target:

• Excellent Core Web Vitals
• SSR/SSG/ISR where appropriate
• Very fast category/product pages
• Clean SEO URLs
• Canonical/hreflang controls
• Product/Offer/Breadcrumb/Organization JSON-LD
• XML sitemaps
• Fine-grained caching
• Minimal JavaScript shipped to the browser

One important caveat: the ecommerce backend itself isn't what determines page speed nearly as much as the storefront architecture. A well-built Next.js storefront on Saleor or Medusa can substantially outperform a poorly optimized traditional storefront. www.wpbundle.com

My ranking for your specific priorities: Saleor > Medusa > Shopware > WooCommerce.

If you tell me whether you're building a small store, large catalog, or SEO-heavy content/ecommerce site, I can narrow this down further and compare Saleor vs Medusa specifically for Google rankings, Core Web Vitals, schema markup, and scalability.