ChatGPT answers, unedited

If by “third-party supplier marketplaces” you mean platforms where suppliers provide products/catalogs and your ecommerce system needs to ingest products, inventory, pricing, orders, and fulfillment, I’d rank the options differently than if you simply mean selling on Amazon/Walmart/eBay.

My shortlist

For your particular requirement, I'd start with Shopify and BigCommerce, but I would seriously consider putting a dedicated marketplace/connectivity layer between the ecommerce platform and suppliers.

Shopify currently has a very large supplier/dropshipping ecosystem—its App Store lists 500+ dropshipping apps, including supplier networks such as Syncee, Shopify Collective, CJdropshipping, Printful, etc. Shopify App Store Shopify Help Center

BigCommerce is particularly interesting if you're building a more sophisticated operation. Its ecosystem has hundreds of prebuilt apps, while its Channels Toolkit is explicitly designed for integrations with external marketplaces and other channels. BigCommerce BigCommerce

The important distinction

If you have dozens or hundreds of supplier marketplaces, I wouldn't choose the ecommerce platform solely based on its native integrations.

For example, Mirakl Connect is specifically designed to provide a connectivity layer across hundreds of marketplaces, with pre-built connectors for Shopify, Adobe Commerce, WooCommerce, and BigCommerce. Mirakl

That leads to an architecture like:

Supplier marketplaces → connectivity/integration layer → Shopify/BigCommerce → your storefront

rather than:

Supplier marketplaces → 100 individual Shopify apps

The former is much easier to scale when suppliers have different APIs, feeds, EDI requirements, inventory formats, order workflows, and catalog schemas.

What I'd choose

• Shopify if your priority is the largest selection of ready-made integrations and fastest implementation.
• BigCommerce if you're expecting complex catalogs, B2B, multiple storefronts, sophisticated APIs, or lots of custom integrations. Its architecture is explicitly built around third-party channels and APIs. BigCommerce BigCommerce
• Adobe Commerce if you're an enterprise and expect substantial custom development.
• Shopify/BigCommerce + Mirakl Connect if “lots of supplier marketplaces” is genuinely the core requirement. Mirakl's current connector model is designed specifically to avoid building a separate integration for every marketplace. Mirakl

If you tell me roughly how many supplier marketplaces you need to connect to (e.g. 20, 100, 500+) and name 5–10 of them, I can compare Shopify vs BigCommerce vs Adobe Commerce specifically against those suppliers and tell you which has the broadest actual coverage.

For your particular requirement, I'd start with Shopify and BigCommerce, but I would seriously consider putting a dedicated marketplace/connectivity layer between the ecommerce platform and suppliers.

Shopify currently has a very large supplier/dropshipping ecosystem—its App Store lists 500+ dropshipping apps, including supplier networks such as Syncee, Shopify Collective, CJdropshipping, Printful, etc. Shopify App Store Shopify Help Center

BigCommerce is particularly interesting if you're building a more sophisticated operation. Its ecosystem has hundreds of prebuilt apps, while its Channels Toolkit is explicitly designed for integrations with external marketplaces and other channels. BigCommerce BigCommerce

The important distinction

If you have dozens or hundreds of supplier marketplaces, I wouldn't choose the ecommerce platform solely based on its native integrations.

For example, Mirakl Connect is specifically designed to provide a connectivity layer across hundreds of marketplaces, with pre-built connectors for Shopify, Adobe Commerce, WooCommerce, and BigCommerce. mirakl.com

That leads to an architecture like:

Supplier marketplaces → connectivity/integration layer → Shopify/BigCommerce → your storefront

rather than:

Supplier marketplaces → 100 individual Shopify apps

The former is much easier to scale when suppliers have different APIs, feeds, EDI requirements, inventory formats, order workflows, and catalog schemas.

What I'd choose

If your main requirement is integrating with many third-party supplier marketplaces (supplier catalogs, dropship networks, distributor feeds, marketplaces, PIM/ERP systems, order routing, inventory sync), the answer is usually not just “which ecommerce platform has the most apps?” — it depends on whether you need connectors already built or maximum integration flexibility.

A practical ranking:

www.bigcommerce.combusiness.adobe.com

My shortlist for a supplier-marketplace-heavy business

1. Adobe Commerce (Magento) — broadest for complex supplier networks

• Strong choice if you have:
  • hundreds/thousands of suppliers
  • custom product feeds
  • complex catalog rules
  • multiple inventory sources
  • marketplace-style workflows
• Large extension ecosystem and very flexible APIs.
• Often paired with integration middleware (Boomi, Celigo, MuleSoft, custom APIs).

business.adobe.com

2. Shopify Plus — broadest “ready-made connector” ecosystem

• Best if you want to connect quickly to:
  • dropship suppliers
  • marketplaces
  • fulfillment providers
  • marketing tools
  • retail channels
• Shopify’s app ecosystem is one of the largest in ecommerce, but highly specialized B2B/supplier workflows may require apps or middleware.

business.adobe.comwww.shopify.comwww.bigcommerce.com

3. BigCommerce — strongest middle ground

• Good if you need:
  • open APIs
  • B2B purchasing workflows
  • multiple sales channels
  • less custom engineering than Adobe
• Often a good fit for distributors and wholesalers.

www.bigcommerce.com

If your suppliers are marketplaces specifically

If you mean integrations like:

• Amazon Marketplace
• eBay
• Walmart Marketplace
• Faire
• Alibaba
• wholesale supplier portals
• dropship networks
• distributor catalogs

Then you may actually want a commerce platform + integration hub, such as:

• ChannelEngine
• Rithum (formerly ChannelAdvisor)
• Celigo
• Boomi

The ecommerce platform becomes the storefront/order system, while the integration layer manages supplier connections.

My recommendation by scenario

• 1,000+ suppliers, complex inventory/pricing: Adobe Commerce + middleware
• Hundreds of suppliers, fast growth, lean tech team: Shopify Plus + integration apps/middleware
• B2B distributor model: BigCommerce B2B
• Building a marketplace like Amazon: composable stack (commercetools or Adobe Commerce)

A key question: are you trying to build a multi-vendor marketplace where suppliers sell through you, or a retailer/distributor store that pulls products from many supplier marketplaces? The best architecture differs a lot.

If by “supplier marketplaces” you mean platforms where you source products from many third-party suppliers—wholesale, dropship, distributor, catalog, or marketplace suppliers—then Shopify is probably the strongest choice for breadth of supplier integrations, while BigCommerce is stronger if you want a more API-centric, enterprise-friendly architecture.

My shortlist

Why I'd start with Shopify

The Shopify App Store currently has hundreds of sourcing integrations—its sourcing category alone lists roughly 480 apps, covering dropshipping, wholesale, POD, and supplier sourcing. Shopify App Store Shopify App Store

Examples include Faire, Syncee, DSers, CJdropshipping, Spocket, AutoDS, Trendsi, DropCommerce, Alibaba/AliExpress, etc. Shopify also has Shopify Collective for connecting retailers directly with suppliers. Shopify App Store Shopify

That matters because you don't necessarily need Shopify itself to have a native integration with every supplier. An app can act as the connector.

BigCommerce is the other one I'd seriously consider

BigCommerce has a very broad third-party integration architecture. Its Channels Toolkit is specifically designed so partners can build integrations with external marketplaces and channels, and its APIs can connect virtually any external platform. BigCommerce BigCommerce

I'd lean BigCommerce over Shopify if your requirements include things like:

• Multiple suppliers feeding the same catalog
• Complex product/variant structures
• Lots of custom inventory rules
• ERP/PIM/WMS integration
• Multi-storefront
• B2B pricing
• Heavy API/EDI integration
• Less dependence on proprietary apps

There's an important third option: Mirakl

If your real problem is “we need one integration layer that connects us to dozens/hundreds of marketplaces”, rather than simply “which ecommerce storefront has the most apps?”, I'd investigate Mirakl Connect.

Mirakl explicitly offers hundreds of marketplace channels and pre-built connectors for Shopify, Adobe Commerce, WooCommerce, and BigCommerce. It is designed to let you connect to additional marketplaces without developing a separate integration for each one. Mirakl

So the architecture could look like:

Your ecommerce platform → integration hub → dozens/hundreds of supplier marketplaces

rather than:

Your ecommerce platform → Supplier A
Your ecommerce platform → Supplier B
Your ecommerce platform → Supplier C
...and so on.

My recommendation

If you're starting from scratch, I'd narrow it to:

Shopify + supplier/integration apps → best if breadth and speed are the priority.

BigCommerce + integration middleware → best if scale, APIs, complex catalogs and operational control are priorities.

Adobe Commerce → best if you have a substantial development team and unusually complex B2B/catalog requirements.

Mirakl Connect + Shopify/BigCommerce/etc. → best if connecting to a very large number of supplier/marketplace endpoints is the core requirement.

If you give me 5–10 examples of the supplier marketplaces you need to connect to (e.g. Faire, Alibaba, Faire, Ankorstore, Syncee, Amazon, distributors, specific industry marketplaces), I can compare Shopify vs BigCommerce vs WooCommerce vs Adobe Commerce specifically against those integrations and tell you which has the best coverage.

If by “third-party supplier marketplaces” you mean platforms where you source products/suppliers—e.g. dropship networks, wholesale marketplaces, supplier catalogs, and marketplaces that expose product/order feeds—the answer is a little different from simply asking which ecommerce platform has the biggest app store.

My shortlist

For your particular requirement, I'd start with Shopify or Adobe Commerce.

Shopify has a very large third-party app ecosystem; its marketplace category alone currently shows 224 apps with product-sync functionality, and Shopify specifically supports marketplace integrations for channels such as Amazon, Target Plus, Walmart and eBay. apps.shopify.com

Adobe Commerce is particularly compelling if supplier integration is the central architectural requirement, because its extension ecosystem and APIs make it easier to build/customize integrations. For example, M2E's Adobe Commerce extension connects multiple marketplaces—including Amazon, eBay, Walmart, TikTok Shop, Kaufland and Otto—from one interface. commercemarketplace.adobe.com

But there's an important twist

If you need to connect to dozens or hundreds of supplier/marketplace systems, I wouldn't make the ecommerce platform itself responsible for all those integrations.

I'd use:

Ecommerce platform → integration/multichannel layer → supplier marketplaces

For example, ChannelEngine says it currently connects to 1,300+ marketplaces and online sales channels, with ready-made connections for Shopify, Adobe Commerce, SAP, Microsoft Business Central, NetSuite and others. www.channelengine.com

Mirakl Connect is another particularly interesting option: it provides connectors for Shopify, Adobe Commerce, WooCommerce and BigCommerce and says its network supports 450+ marketplaces. www.mirakl.com

That architecture means you aren't betting your entire business on whether Shopify/Magento/etc. has a plugin for Supplier X. The integration layer handles that.

What I'd choose

If you're building a new operation today:

Shopify + ChannelEngine → probably the best balance of breadth, speed and lower technical overhead.

Adobe Commerce + ChannelEngine/Mirakl → better if you have complex catalogs, sophisticated pricing/inventory rules, B2B requirements, or a development team.

BigCommerce + ChannelEngine/Mirakl → worth serious consideration if B2B and headless architecture are important.

ChannelEngine explicitly supports Shopify, Adobe Commerce, BigCommerce and a range of ERP/PIM/WMS systems, so it can sit above whichever commerce platform you select. www.channelengine.com

One caveat: “broadest integrations” can mean number of apps, number of supplier marketplaces, or quality/depth of API integrations. Those produce different winners.

If you give me 5–10 examples of the supplier marketplaces you need to connect to (e.g. Faire, Ankorstore, Alibaba, Spocket, Syncee, Mirakl marketplaces, specific distributors, etc.), I can compare Shopify vs BigCommerce vs Adobe Commerce vs WooCommerce specifically against those suppliers and tell you which has the strongest coverage.

If by “supplier marketplaces” you mean platforms where you source products from many third-party suppliers and need to sync catalogs, inventory, pricing, orders, and fulfillment, I’d shortlist them differently than if you simply mean sales marketplaces like Amazon/eBay.

My ranking for your use case

Shopify is probably the safest answer if your primary criterion is the sheer number of ready-made supplier integrations. Its App Store currently has hundreds of dropshipping/sourcing apps, including connections to suppliers such as AliExpress, Alibaba, and various US suppliers. apps.shopify.com

However, BigCommerce is arguably the stronger architecture if you're building a serious multi-supplier operation. BigCommerce says it has 1,200+ native integrations, and its Channel Manager/Channels Toolkit is specifically designed to connect external marketplaces and sales channels. www.bigcommerce.com

The important distinction

If you're saying:

“We want to connect to lots of supplier marketplaces, potentially hundreds, and have their products/inventory/orders flow into our ecommerce operation.”

I wouldn't choose the ecommerce platform based solely on its app count.

I'd consider using an integration/multichannel layer on top of the ecommerce platform. For example, Mirakl Connect currently advertises access to 170+ marketplaces and pre-built connectors for Shopify, Adobe Commerce, WooCommerce, and BigCommerce. Its broader Mirakl ecosystem connects to hundreds of Mirakl-powered marketplaces. www.mirakl.com

That gives you an architecture more like:

Supplier marketplaces → integration hub → Shopify/BigCommerce → your storefront

rather than:

Supplier marketplace → individual Shopify plugin → storefront

The first approach is much easier to scale when the number of suppliers gets large.

What I'd choose

• <20–30 suppliers, mostly standard dropshipping: Shopify
• Dozens/hundreds of suppliers + complex inventory/order flows: BigCommerce + integration middleware
• Enterprise marketplace / dropship operation: Mirakl + BigCommerce/Adobe/Salesforce
• You need to build unusual/custom integrations yourself: BigCommerce or WooCommerce
• You want the largest plug-and-play app ecosystem: Shopify

If you tell me which supplier marketplaces you need to connect to (e.g. Faire, Alibaba, Spocket, Syncee, Modalyst, Wholesale2B, BrandsGateway, Mirakl marketplaces, etc.), I can map them across Shopify vs BigCommerce vs WooCommerce vs Adobe Commerce and tell you which one actually gives you the broadest coverage for your specific suppliers.

If by “supplier marketplaces” you mean platforms where you source products from third-party suppliers/brands and want their catalogs, inventory, pricing, orders, and fulfillment synced into your store, I’d shortlist these:

My recommendation: Shopify + an integration layer

For your specific requirement, I would not judge the ecommerce platform solely by its native integrations. The more important architecture is:

Shopify → integration/multichannel middleware → supplier marketplaces

Shopify has a particularly large app ecosystem, and its marketplace documentation explicitly points merchants toward third-party apps for connecting additional marketplaces. It also has native connections to places such as Faire, Amazon, Walmart and eBay. www.shopify.com

For example, Faire has a direct Shopify integration that can synchronize products, inventory and orders. Faire also lists numerous other integration partners, including Order Desk, Syncware, ShipStation and others. www.faire.com

But there's an important alternative: Mirakl Connect

If you're talking about hundreds of supplier/marketplace connections, I'd seriously investigate Mirakl Connect rather than trying to find an ecommerce platform that natively integrates with everything.

Mirakl says Connect provides access to 450+ marketplace channels, with pre-built connectors for Shopify, Adobe Commerce, WooCommerce and BigCommerce. It can synchronize catalog, inventory, pricing and orders, while handling marketplace-specific catalog transformations. www.mirakl.com

So an architecture like:

Shopify
↓
Mirakl Connect
↓ ↓ ↓ ↓
Supplier A | Supplier B | Supplier C | Supplier D
Marketplace 1 | Marketplace 2 | Marketplace 3 | Marketplace 4

could be substantially easier to scale than building a separate integration for every supplier.

If you're building something enterprise-scale

I'd rank them:

1. Shopify — best breadth + fastest implementation
2. BigCommerce — particularly good if you need a more open/API-centric architecture
3. Adobe Commerce — best when you have developers and complex bespoke requirements
4. Salesforce Commerce Cloud — excellent enterprise ecosystem, but usually heavier than necessary

BigCommerce has hundreds of pre-built apps across 20+ categories and a dedicated Channels Toolkit for connecting external marketplaces. docs.bigcommerce.com Adobe, meanwhile, says its ecosystem contains thousands of integrations/extensions. business.adobe.com

The key question is what you mean by “supplier marketplaces.” If you give me 5–10 examples of the marketplaces/supplier networks you need to connect to (e.g. Faire, Alibaba, Ankorstore, Faire, Mirakl, Amazon, Walmart, Syncee, Spocket, etc.), I can compare Shopify vs BigCommerce vs Magento specifically against those integrations and tell you which has the broadest actual coverage.

If by “supplier marketplaces” you mean platforms such as Faire, Alibaba, Spocket, DSers/AliExpress, Printful/Printify, wholesale networks, dropship suppliers, EDI suppliers, and niche vendor marketplaces, Shopify is probably the strongest choice for breadth of integrations.

The important distinction is that there isn't one ecommerce platform with a native connection to every supplier. What matters is the size and maturity of its app/integration ecosystem.

My ranking for your use case

Why I'd lean Shopify

Shopify's sourcing ecosystem is unusually large. Its marketplace currently lists hundreds of sourcing/dropshipping apps; for example, its sourcing category shows roughly 480 apps, while the US dropshipping category alone has 560+ apps. apps.shopify.comapps.shopify.comdocs.bigcommerce.com

That includes connectors for things like Faire, DSers/AliExpress, Printify, Spocket, AutoDS, CJdropshipping, Gelato, Apliiq, and numerous smaller supplier/fulfillment networks. apps.shopify.comapps.shopify.com

So if your requirement is:

“We want to be able to add a new supplier marketplace without rebuilding our ecommerce platform every time.”

Shopify would be my first platform to investigate.

Shopify App Store — sourcing & supplier integrations

But there's one important caveat

If you're talking about hundreds of suppliers feeding products/inventory/orders into one centralized catalog, rather than simply “which ecommerce platform has the most apps,” I'd actually consider a supplier/integration hub sitting between the marketplaces and your ecommerce platform.

For example:

Supplier marketplaces → integration/automation layer → Shopify/BigCommerce → customers

That architecture is much more scalable because you can change your storefront without having to rebuild all your supplier connections.

BigCommerce is particularly interesting here: its APIs and channel architecture are explicitly designed to connect external marketplaces and channels, and its ecosystem supports additional third-party integrations beyond its native channels. docs.bigcommerce.com

If you tell me your supplier marketplaces, I can be much more specific

Give me 5–20 of the marketplaces/supplier networks you need to connect (e.g. Faire, Alibaba, Amazon, Walmart, Spocket, Printful, EDI suppliers, etc.), and I can build you a Shopify vs BigCommerce vs WooCommerce comparison showing exactly which ones have native integrations, third-party connectors, APIs, and what the likely integration architecture would be.

If by “supplier marketplaces” you mean platforms where you source products from many third-party suppliers/wholesalers/dropshippers and need those suppliers’ catalogs, inventory, pricing, and orders to flow into your store, I’d narrow the field to Shopify, BigCommerce, Adobe Commerce (Magento), and WooCommerce—but the answer depends heavily on whether you want native integrations or are willing to use a connector layer.

My take

Shopify is probably the safest choice if “broadest integrations” is your primary criterion. Its app ecosystem is enormous, and its marketplace category currently has 200+ apps covering product sync, marketplace connections, order synchronization, feeds, and supplier integrations. apps.shopify.com

For example, Shopify has direct/third-party connectivity for major channels such as Amazon, eBay, Walmart, Etsy, TikTok Shop and Target Plus, while apps such as Syncee, LitCommerce, CedCommerce, Channable and others extend the supplier/channel coverage considerably. apps.shopify.com

But there's an important distinction

If you're talking about hundreds of supplier marketplaces, I wouldn't choose an ecommerce platform based solely on its app store.

I'd consider putting a marketplace integration layer between your ecommerce platform and suppliers.

A particularly interesting option is Mirakl Connect. It says it provides connections to 450+ marketplaces, with prebuilt connectors for Shopify, Adobe Commerce, WooCommerce and BigCommerce, plus API, EDI and SFTP options for suppliers that don't have a standard connector. www.mirakl.com

That gives you an architecture like:

Supplier marketplaces → integration hub → Shopify/BigCommerce → your storefront

rather than:

Supplier marketplace #1 → Shopify app
Supplier marketplace #2 → Shopify app
Supplier marketplace #3 → Shopify app
...etc.

That's much more scalable if you're expecting dozens or hundreds of suppliers.

What I'd recommend

For a startup/mid-market operation:
Shopify + a marketplace/supplier integration layer is my first choice.

For a larger B2B operation with complex catalogs/pricing:
BigCommerce + integration middleware is worth serious consideration.

For enterprise with a large technical team:
Adobe Commerce + Mirakl/integration middleware gives you enormous control. Mirakl specifically has an official Adobe Commerce connector that can connect Magento to Mirakl-powered marketplaces. commercemarketplace.adobe.com

If you actually mean “we are building our own marketplace and need to onboard lots of independent suppliers”:
I'd shift the recommendation toward Mirakl rather than choosing Shopify first. Mirakl supports supplier onboarding via API, CSV, XML and EDI and says its network includes 13,000+ pre-vetted sellers. mirakl.com

If you give me 5–10 of the supplier marketplaces you need to integrate with (e.g. Faire, Alibaba, Faire, Spocket, Syncee, Mirakl marketplaces, Amazon, Walmart, etc.), I can compare Shopify vs BigCommerce vs Adobe vs WooCommerce specifically against those suppliers and tell you which has the strongest coverage.

If by “supplier marketplaces” you mean platforms where you source products from third-party suppliers—wholesale, dropship, distributor, and supplier networks—the answer is a little different from simply counting ecommerce apps.

My short answer

Shopify has the broadest supplier-app ecosystem overall. Its App Store currently has roughly 480 apps in its sourcing-options category, spanning dropshipping, wholesale, and print-on-demand. apps.shopify.com

But if your requirement is “we need to connect to lots of marketplaces and potentially build/customize integrations ourselves,” I'd strongly consider BigCommerce. Its architecture is unusually integration-friendly: it exposes APIs and a dedicated Channels Toolkit for connecting external marketplaces and channels, and its app ecosystem covers 20+ categories. docs.bigcommerce.com

There's also an important third option:

Shopify + a marketplace integration layer such as ChannelEngine can be extremely broad. ChannelEngine says its Shopify integration connects to 1,300+ marketplaces, including Amazon, Target Plus, Mercado Libre and Zalando, while synchronizing products, inventory, orders and pricing. www.channelengine.com

BigCommerce itself advertises 150+ global sales channels, and its open APIs are designed to synchronize inventory and orders with third-party channels. www.bigcommerce.com ChannelEngine's BigCommerce integration adds 950+ marketplaces and sales channels. www.channelengine.com

What I'd choose

If your business model is essentially:

“We have dozens/hundreds of suppliers, each potentially on a different marketplace/API, and we need to ingest catalogs, prices, inventory and orders.”

I'd shortlist BigCommerce + an integration/marketplace middleware layer rather than choosing an ecommerce platform purely on its native integrations.

The key question isn't really “which ecommerce platform has the most integrations?” It's “which platform has the best coverage of the specific supplier marketplaces we need?”

If you give me 5–10 of the supplier marketplaces you need to connect to (e.g. Faire, Alibaba, Faire, Spocket, Syncee, distributor APIs, specific regional marketplaces, etc.), I can compare Shopify vs BigCommerce vs WooCommerce vs Magento/Adobe Commerce against those exact suppliers and tell you which has the strongest coverage.

If by “supplier marketplaces” you mean platforms/directories where you source products or connect suppliers—rather than simply selling on Amazon/eBay/Walmart—then I’d narrow the field differently.

My shortlist

My default recommendation would be Shopify if your primary requirement is “connect me to as many different supplier sources as possible.” Shopify has a very large app ecosystem, including dedicated sourcing/dropshipping apps and supplier networks. Its current marketplace documentation lists integrations ranging from Faire and specialist marketplaces to Amazon, Walmart, eBay, Temu and others. apps.shopify.com

BigCommerce is arguably better if your operation is fundamentally multichannel. Its Channel Manager/Channels Toolkit is explicitly designed around connecting external marketplaces, and BigCommerce says its ecosystem has 1,200+ native integrations. It also supports marketplace channels including Amazon, Walmart, eBay, Target+ and Mercado Libre. docs.bigcommerce.com

Adobe Commerce is particularly compelling if you're talking about an enterprise operation with unusual suppliers and a willingness to build/commission integrations. Adobe says its marketplace has thousands of integrations/extensions, and its App Builder is designed for custom ERP, CRM, PIM and other integrations. business.adobe.com

But there's an important wrinkle: you may not actually want your ecommerce platform to have the most integrations. If you need to connect to hundreds of supplier/marketplace networks, a dedicated connectivity layer can be much more powerful. Mirakl Connect, for example, advertises hundreds of marketplace channels and pre-built connectors for Shopify, Adobe Commerce, WooCommerce and BigCommerce. www.mirakl.com

What I'd choose

• Lots of independent suppliers / dropship sources → Shopify
• Lots of sales marketplaces + sophisticated catalog/order synchronization → BigCommerce
• Large enterprise + custom supplier integrations → Adobe Commerce
• Hundreds of marketplaces specifically → Ecommerce platform + Mirakl Connect
• Lowest-cost/open ecosystem and you're comfortable with WordPress → WooCommerce

If you give me 5–10 of the supplier marketplaces you need to integrate with (e.g. Faire, Alibaba, Ankorstore, Spocket, Syncee, DSers, Mirakl marketplaces, etc.), I can make a much more definitive comparison and tell you which platform has native/prebuilt integration to the most of them, rather than relying on overall app-count claims.

If by “third-party supplier marketplaces” you mean platforms where you can source products from many different suppliers/wholesalers/dropshippers—and you need the ecommerce platform with the widest ecosystem of ready-made integrations—I’d put Shopify first.

My ranking

Why Shopify: its App Store currently has roughly 480 sourcing-option apps covering dropshipping, wholesale and print-on-demand, with integrations including Faire, CJdropshipping, DSers/AliExpress, AutoDS, Trendsi, Printful, Gelato and others. apps.shopify.com Shopify also explicitly supports connecting to suppliers outside its own ecosystem. help.shopify.com

For example, if you anticipate needing 10–30 different supplier marketplaces, Shopify is attractive because you can generally find an app/integration for each rather than building the connection yourself.

BigCommerce is the one I'd investigate alongside Shopify if you're doing something more sophisticated. Its architecture is particularly integration-friendly: its Channel Manager and APIs are designed to connect external marketplaces and sales channels, and its App Marketplace has hundreds of prebuilt integrations across 20+ categories. apps.shopify.comhelp.shopify.comdocs.bigcommerce.comexperienceleague.adobe.com

Adobe Commerce can potentially beat both for custom integrations because it's extremely extensible, but that's a different proposition—you'll generally be paying for development rather than simply installing an app. Its Marketplace provides reviewed extensions and its integration framework supports third-party systems. experienceleague.adobe.com

One important distinction

If you're talking about marketplaces such as Faire, Alibaba, AliExpress, Wholesale2B, Spocket, Syncee, Modalyst, Inventory Source, Printful, etc., I'd evaluate the platforms based on your actual supplier list, not the raw number of apps.

If you give me 5–10 supplier marketplaces you need to integrate with, I can compare Shopify vs BigCommerce vs WooCommerce vs Adobe Commerce specifically against those suppliers and tell you which has the broadest real coverage.

If by “third-party supplier marketplaces” you mean platforms where you can source products from many suppliers—dropship networks, wholesale marketplaces, vendor catalogs, and marketplace/dropship networks—the answer is a little different from simply counting ecommerce apps.

My shortlist

If your primary requirement is “connect to as many different suppliers as possible,” I'd start with Shopify—but I'd evaluate the supplier-integration layer separately from the ecommerce platform.

For example, Mirakl Connect is specifically designed to connect sellers to hundreds of marketplaces and has prebuilt connectors for Shopify, Adobe Commerce, WooCommerce and BigCommerce. www.mirakl.com It may therefore give you considerably more supplier/marketplace coverage than choosing an ecommerce platform based solely on its native integrations.

Shopify

Shopify has an enormous app ecosystem, and its marketplace tooling already supports major channels such as Amazon, eBay, Walmart and Target Plus. help.shopify.com It also has Shopify Collective, which lets retailers source products from other Shopify merchants and have supplier orders fulfilled directly. help.shopify.com

The big advantage is breadth + ease of implementation. If a particular supplier has a Shopify app/API connector, getting it operational is usually considerably easier than building a custom integration.

Shopify

Adobe Commerce

If you're talking about maximum integration flexibility rather than ease, Adobe Commerce/Magento is probably the strongest candidate. Adobe says its ecosystem has thousands of integrations and extensions, and its Marketplace supports third-party extensions that can add integrations and other functionality. business.adobe.com

There are also dedicated multichannel extensions—for example, M2E's integration can connect Adobe Commerce to Amazon, eBay, Walmart, TikTok Shop, Kaufland, Otto, OnBuy and others. commercemarketplace.adobe.com

Adobe Commerce

BigCommerce

I'd put BigCommerce particularly high if you're doing B2B / wholesale / dropship. Its architecture explicitly supports third-party marketplaces and sales channels, and its App Marketplace has hundreds of integrations across fulfillment, sales channels, accounting, marketing, etc. docs.bigcommerce.com

BigCommerce itself highlights supplier/dropshipping integrations such as Avasam and Spocket. www.bigcommerce.com

BigCommerce

The important distinction

I'd actually architect this as:

Supplier marketplaces → integration/aggregation layer → ecommerce platform → OMS/ERP

rather than expecting Shopify/Magento/BigCommerce itself to have a native connector for every supplier.

For example:

Supplier A
Supplier B
Supplier C
↓
Mirakl Connect / similar integration hub
↓
Shopify / Adobe Commerce / BigCommerce
↓
ERP + fulfillment

Mirakl explicitly supports API, EDI, CSV, XML and portal-based supplier connectivity, and its Dropship product can run marketplace and dropship operations together. www.mirakl.com

My recommendation

If you give me the actual supplier marketplaces you need to connect to—even just 10–20 names—I can make a much more useful comparison. I can build a matrix showing Shopify vs BigCommerce vs Adobe Commerce vs WooCommerce, with each supplier marked native / app / connector / API / custom development, and identify which combination gives you the widest coverage with the least custom integration work.

If your main requirement is integrating with a large number of third-party supplier marketplaces (supplier catalogs, dropship networks, B2B marketplaces, distributors, EDI/API feeds, inventory sync, order routing), the answer is usually not just the ecommerce storefront — it is the combination of:

1. Commerce platform
2. Marketplace/integration layer
3. PIM/OMS/ERP connectors

The platforms with the broadest integration ecosystems are typically:

www.shopify.comwww.bigcommerce.com

If you mean "connect to the most supplier marketplaces"

I would shortlist these:

1. Adobe Commerce (Magento) — strongest for complex supplier ecosystems

Best when you need:

• hundreds of supplier feeds
• custom pricing rules
• large catalogs
• vendor-specific workflows
• ERP/WMS integration
• custom APIs

Its advantage is flexibility: almost anything can be integrated, but you usually need developers or an implementation partner. Adobe highlights integrations through its ecosystem and extension marketplace. business.adobe.com

2. Shopify Plus — biggest ecosystem overall

Best when you want:

• many prebuilt connectors
• fast onboarding
• marketplace apps
• dropship integrations
• lower maintenance

Shopify has a very large app ecosystem, and tools like Shopify Marketplace Connect can synchronize products, listings, inventory, and orders across marketplaces such as Amazon, Walmart, eBay, and others. help.shopify.com

The limitation: very complex supplier procurement workflows often require middleware or custom apps.

3. BigCommerce — strongest "open" SaaS option

Good choice if you need:

• many integrations
• API access
• B2B purchasing workflows
• multiple storefronts
• marketplace/channel expansion

BigCommerce emphasizes a large native integration ecosystem and connections to marketplace/channel tools such as ChannelAdvisor and Feedonomics. www.shopify.comwww.bigcommerce.com

For a supplier-marketplace-heavy business, I would also evaluate integration hubs:

• ChannelEngine — connects sellers to many marketplaces
• ChannelAdvisor — enterprise marketplace management
• Feedonomics — catalog syndication
• Celigo / Boomi — middleware for ERP and supplier connections

My practical ranking for your use case

If you are building a marketplace aggregator or distributor:

1. Adobe Commerce + integration middleware
2. BigCommerce + marketplace connectors
3. Shopify Plus + connector ecosystem

If you are a DTC brand adding supplier marketplaces:

1. Shopify Plus
2. BigCommerce
3. Adobe Commerce

If you expect thousands of suppliers with different feeds/APIs/EDI formats:
Look less at the storefront and more at an OMS/PIM/integration architecture. The commerce platform becomes the customer-facing layer.

A few details would change the recommendation:

• Are these supplier marketplaces like Faire, Alibaba, Amazon Business, etc., or sales marketplaces like Amazon/eBay/Walmart?
• Do suppliers provide API feeds, EDI, CSV files, or portal-only access?
• Roughly how many suppliers (10s, 100s, 1000s)?

If your priority is integrating with a large number of third-party supplier marketplaces (not just selling on Amazon/eBay, but connecting supplier catalogs, dropship feeds, vendor portals, ERPs, PIMs, EDI networks, and marketplace APIs), the answer is usually not just the ecommerce platform—it is the combination of commerce platform + integration layer. www.shopify.cominterlinkcommerce.com

A practical ranking:

elogic.cowww.shopify.com

My recommendation by scenario

1. You need hundreds of suppliers, complex catalogs, pricing rules, inventory feeds → Adobe Commerce

• Strongest customization capabilities.
• Large ecosystem of extensions/connectors.
• Good for distributors, wholesalers, marketplaces, and multi-vendor models.
• Often paired with middleware such as Boomi, MuleSoft, Celigo, or custom APIs. elogic.cobusiness.adobe.com

2. You need the widest ready-made connector ecosystem → Shopify Plus

• Shopify has one of the largest ecommerce app ecosystems.
• Strong for connecting to marketplaces like Amazon, Walmart, eBay, TikTok Shop, Faire, and others through apps/connectors. www.shopify.com
• Less ideal if suppliers have unusual EDI/API requirements or complex wholesale rules.

3. You need an API-first backbone → commercetools

• Best if you have engineering resources and want to build a commerce operating system rather than rely on plugins.
• Excellent for many supplier integrations, but requires more technical ownership. elogic.cowww.shopify.com

4. You are a B2B distributor with many vendor feeds → consider an integration hub
Often the architecture looks like:

Supplier marketplaces / ERPs / EDI feeds
↓
Integration platform (Boomi, MuleSoft, Celigo, Patchworks, SPS Commerce, etc.)
↓
Commerce platform (Adobe, Shopify Plus, BigCommerce, etc.)
↓
Storefront

The integration hub is usually the limiting factor, not the ecommerce platform itself. www.shopify.cominterlinkcommerce.com

Short answer

• Broadest overall enterprise integration capability: Adobe Commerce
• Broadest plug-and-play marketplace/app ecosystem: Shopify Plus
• Most flexible for a custom supplier marketplace network: commercetools
• Best balance for many B2B companies: BigCommerce or Shopify Plus + middleware

If you mean “supplier marketplaces” as in dropship suppliers (like Spocket, Faire, AliExpress, wholesale catalogs) versus “marketplaces you sell on (Amazon/Walmart/eBay)”, the best choice changes significantly.