ChatGPT answers, unedited

For a small agency managing dozens of client ad accounts, I’d shortlist these—but Smartly is the strongest all-around fit if you want optimization and reporting in one system.

My recommendation: Smartly

Smartly is built specifically for agencies managing multiple advertisers. It can manage campaigns across multiple accounts from a centralized workspace, automate campaign changes, optimize budgets, and provide unified cross-channel reporting. www.smartly.iodocs.smartly.io

Particularly useful at your scale:

• Multi-account management — manage multiple Meta accounts from a single view rather than jumping between Ads Managers. www.smartly.iodocs.smartly.io
• Automated optimization — rules/triggers can pause poor performers, scale winners, and automate budget adjustments. www.smartly.io
• Cross-channel reporting — consolidate performance across channels into customizable dashboards. www.smartly.io
• Google + Meta + TikTok + Pinterest + Snapchat + others — useful if your clients aren't all on one platform. www.smartly.iodocs.smartly.iodocs.smartly.io
• Agency-oriented workflows — Smartly explicitly positions its platform around agencies managing multiple clients and scaling reporting. www.smartly.io

But I'd choose based on your setup

The important distinction is that reporting software and optimization software solve different problems. If your biggest pain is spending hours every week checking 30–50 accounts, you want automation that actually takes actions, not merely a dashboard that tells you what happened.

For example, Smartly's automation can use performance conditions to change campaigns and its Predictive Budget Allocation can dynamically shift budget based on performance. docs.smartly.io

For a small agency, I'd avoid immediately buying an enterprise-sized stack. I'd first test Smartly against your actual workflow on perhaps 3–5 representative clients: one Meta-heavy, one Google-heavy, and one multi-channel account. Measure how many hours it eliminates from weekly optimization/reporting and whether its automated decisions meet your quality bar.

If you tell me which platforms you manage (Meta, Google, TikTok, LinkedIn, etc.), roughly how many accounts, and whether your bigger headache is optimization or client reporting, I can narrow this down to the 2–3 tools I'd actually consider for your agency, including approximate pricing and tradeoffs.

For a small digital agency managing dozens of client ad accounts, you usually want a stack, not a single tool: one layer for campaign monitoring/optimization and one for client reporting. The best choice depends on whether your bottleneck is execution, reporting, or both. Synter Wevion

My shortlist

Best all-around agency reporting + client management

AgencyAnalytics

Best if you need:

• White-labeled client dashboards
• Automated monthly/weekly reports
• Google Ads, Meta Ads, GA4, SEO, call tracking, and other integrations
• A client-facing portal

It is one of the more common fits for agencies that need repeatable reporting workflows across many accounts. AgencyPro The Digital Project Manager

Best for paid media teams focused on PPC optimization

Optmyzr

Best if your team spends most of its time inside:

• Google Ads
• Microsoft Ads
• Shopping campaigns
• Bid management
• Search term analysis
• Rules and automation

It is more of an optimization engine than a client reporting platform.

Best low-cost/customizable setup

Looker Studio + connectors

Best if you have someone technical who can maintain dashboards.

Pros:

• Very flexible
• Cheap/free entry point
• Great for Google-heavy clients

Cons:

• More setup and maintenance
• Cross-platform reporting often requires connectors. Pace Ads

Best polished cross-channel client reporting

Whatagraph or DashThis

Good for agencies that want:

• Fast report creation
• Attractive dashboards
• Less manual formatting
• Multiple marketing channels in one view The Digital Project Manager The Digital Project Manager

A practical agency stack

For a 10–50 client agency, I’d usually set it up like this:

• Campaign execution: native ad platforms + optimization tooling - Google Ads Editor
• Meta Ads Manager
• Optmyzr (if PPC-heavy)
• Reporting: AgencyAnalytics / Whatagraph / DashThis
• Data warehouse (optional): BigQuery + Looker Studio when you need deeper analysis
• Client communication: automated dashboards + scheduled executive summaries

What I’d pick for your situation

Since you said “dozens of client ad accounts”, I would lean:

1. AgencyAnalytics if your main pain is reporting and client transparency. AgencyPro
2. Optmyzr + AgencyAnalytics if your team is actively optimizing lots of PPC accounts every week.
3. Looker Studio + connectors if you have technical capacity and want maximum customization. Pace Ads

A few questions would narrow it down:

• Are most accounts Google Ads, Meta Ads, or both?
• How many clients/accounts are you managing (10, 50, 100+)?
• Do you need AI-driven optimization, or mainly reporting automation?
• Are clients expecting white-labeled dashboards they can log into?

For a small agency managing dozens of ad accounts, I’d start with optmyzr.com.

It’s one of the better fits when you want both campaign optimization and reporting at scale, rather than just a reporting dashboard.

Why I’d pick Optmyzr

• Multi-account optimization: You can apply optimization workflows across many accounts, including bid/budget management, keyword/search-term work, ad optimization, placement exclusions, and other recurring tasks. Optmyzr Google Ads Optimization Optmyzr Google Ads Optimization
• Automation with guardrails: Its Rule Engine lets you automate recurring optimization tasks while retaining control over what actually changes. Optmyzr Google Ads Optimization Optmyzr Help Center
• Portfolio-level management: Higher-tier plans add portfolio dashboards and optimization insights across groups of accounts—which is particularly useful when you're managing dozens of clients. Optmyzr Help Center
• Reporting is built in: You can create reusable, branded templates, apply them across accounts, schedule delivery, and create multi-account/cross-platform reports. Optmyzr Google Ads Optimization Optmyzr Help Center
• AI assistance: Optmyzr's Sidekick can analyze performance changes, surface insights, help with optimization strategies, and assist with reports. Optmyzr Help Center

One important distinction

If your main pain is client reporting, rather than actually optimizing campaigns, I'd look at agencyanalytics.com instead. It's purpose-built for agencies and focuses heavily on cross-channel dashboards, client-facing reports, automated reporting, and pulling PPC data together. AgencyAnalytics

So I'd think of it this way:

For your situation, I'd trial Optmyzr first. Its current Premium tier specifically adds multi-account/portfolio dashboards and multi-account reporting, which maps closely to the "dozens of client accounts" problem. Optmyzr Help Center

If you tell me whether your accounts are mostly Google Ads, Meta, Microsoft, or a mix, I can narrow this down to the best 3 tools for an agency your size, including approximate pricing and where each one beats Optmyzr.

For a small agency managing dozens of ad accounts, I’d start with optmyzr.com.

Why it fits your use case:

• Optimization at scale: automated rules, scripts, alerts, audits, budget monitoring, and campaign optimization across multiple accounts. Optmyzr Help Center Optmyzr Google Ads Optimization
• Agency workflows: you can standardize recurring optimization tasks and apply them across accounts rather than manually checking every client. Optmyzr Google Ads Optimization
• Reporting: reusable, white-labeled templates and scheduled reports; multi-account reports can combine Google, Microsoft, Meta, Amazon, LinkedIn and Analytics data. Optmyzr Google Ads Optimization Optmyzr Help Center
• Good for exceptions-based management: instead of living in every account, set alerts for things like abnormal CPA, pacing, conversion drops, or overspending and investigate only where something needs attention. Optmyzr Help Center
• It also has AI features aimed at analyzing accounts, identifying opportunities, and accelerating reporting/optimization workflows. Optmyzr Google Ads Optimization

One important alternative

If reporting/client dashboards are your biggest pain point and you're already comfortable optimizing campaigns directly in Google/Meta/etc., I'd look at agencyanalytics.com. It is particularly strong for white-label dashboards, automated client reports, and aggregating data from 85+ sources. AgencyAnalytics AgencyAnalytics Knowledge Base

My pick:
Optmyzr if you want optimization + automation + reporting in one system.
AgencyAnalytics if you primarily need client-facing reporting and dashboards.

For dozens of accounts, I'd lean Optmyzr because reducing the actual account-management workload generally has more operational value than merely automating the reports.

For a small agency managing dozens of client ad accounts, I’d start with Optmyzr.

It’s unusually well matched to your use case because it combines optimization + monitoring + multi-account management + client reporting, rather than making you stitch together separate tools. www.optmyzr.com

Why I’d pick it

• Manage accounts in portfolios: group accounts by client/brand and monitor them from a single dashboard. help.optmyzr.com
• Automate optimization: its Rule Engine can apply strategies across multiple accounts, including Google, Microsoft, Meta and LinkedIn. help.optmyzr.com
• Catch problems proactively: monitor things like spend, performance changes and optimization opportunities rather than manually opening every account. www.optmyzr.com
• Scale reporting: build a report template once and reuse it across clients; multi-account reports can combine Google Ads, Meta, Microsoft, Amazon, LinkedIn and GA4 data. www.optmyzr.comhelp.optmyzr.com
• Automated delivery: schedule client reports rather than having someone manually assemble them every week/month. www.optmyzr.comhelp.optmyzr.com

How I'd structure your stack

ReportGarden is a particularly reasonable alternative if reporting is your primary pain point, but it isn't as strong a fit if you want optimization and reporting in the same workflow. reportgarden.com

Bottom line: if you're at the point where an account manager is wasting hours jumping between 20–50+ accounts, I'd trial Optmyzr first. Its current Premium offering specifically supports portfolio-level optimization and multi-account reporting, which is the scalability feature I'd prioritize. www.optmyzr.comhelp.optmyzr.com

If you tell me roughly how many accounts you manage, which platforms (Google/Meta/Microsoft/etc.), and your monthly ad spend, I can narrow this down to the best 2–3 options and explain the likely cost/ROI tradeoff.

For a small agency managing dozens of ad accounts, I’d put Optmyzr at the top of your shortlist.

Why it fits an agency setup

• Optimization at scale: automated rules, audits, budget pacing, alerts, and one-click optimizations across accounts. It supports Google Ads, Microsoft Ads, Meta, Amazon and other paid-media workflows. www.optmyzr.comwww.optmyzr.com
• Portfolio monitoring: you can monitor multiple accounts and get alerted when KPIs, budgets, or performance move outside your thresholds—useful when you can't manually inspect every account every day. help.optmyzr.com
• Reporting: reusable templates can be applied across accounts, with automated delivery and white-labeling. Multi-account reports can consolidate platforms such as Google, Microsoft, Meta, Amazon and GA4. www.optmyzr.com
• AI layer: its Sidekick can analyze account performance and help identify what needs attention, while keeping you in control of actually applying changes. www.optmyzr.com
• Agency-oriented: Optmyzr specifically positions the product around agencies managing multiple client accounts and standardizing workflows/SOPs. www.optmyzr.comwww.optmyzr.com

My recommendation: if your biggest pain is "I need to manage 30–100 accounts without adding another 5 PPC specialists," I'd test Optmyzr first. If your biggest pain is instead client-facing dashboards/data aggregation across lots of non-ad platforms, I'd evaluate a reporting-first tool separately.

If you tell me roughly how many accounts you manage, which platforms (Google/Meta/Microsoft/etc.), and monthly ad spend, I can narrow it down to the 2–3 best tools and explain which one I'd actually buy.

For a small agency managing dozens of client ad accounts, I’d put Optmyzr at the top of your shortlist.

Why Optmyzr fits an agency workflow

• Multi-account optimization: You can apply optimization workflows across many accounts rather than working inside each ad-platform UI individually. It supports automated rules, audits, alerts, budget optimization, and campaign changes. www.optmyzr.com
• Centralized reporting: Its higher-tier plans provide portfolio/multi-account dashboards and reports spanning Google, Microsoft, Meta, Amazon, LinkedIn, and analytics data. help.optmyzr.com
• Agency-friendly automation: Build a report once, reuse it across clients, white-label it, and schedule delivery. That can eliminate a lot of repetitive monthly reporting work. www.optmyzr.comhelp.optmyzr.comwww.optmyzr.com
• Alerts and monitoring: You can automatically flag KPI anomalies, budget pacing problems, disapproved ads, quality issues, etc., including delivery through Slack or Teams. help.optmyzr.com
• Paid social is increasingly covered: Optmyzr now supports Meta and LinkedIn management alongside search, with portfolio-level monitoring and automated rules. www.optmyzr.com

The main alternative: Marin

Marin Software is worth considering if you're getting into hundreds/thousands of accounts, need particularly sophisticated cross-publisher data management, or want extensive API/Python customization. Marin explicitly targets agencies managing large numbers of client accounts and offers cross-client reporting, automated workflows, dashboards, alerts, and API/script capabilities. www.marinsoftware.com

My pick for your situation: Optmyzr. I'd choose Marin over it primarily if your agency is already operating at a much larger scale or has someone technical who can take advantage of Marin's API/Python capabilities.

If you tell me roughly how many Google/Meta/Microsoft accounts you manage, monthly ad spend, and whether your biggest pain is optimization, reporting, or both, I can narrow this down to the best 2–3 tools and tell you what I'd actually implement.

For a small agency managing dozens of ad accounts, I’d start with Optmyzr.

It’s particularly suited to your use case because it combines optimization, automation, cross-account monitoring, and client reporting rather than being just a reporting dashboard.

Why I’d pick it

• Manage many accounts centrally: its All Accounts Dashboard lets you monitor performance, budgets, account health, and optimization signals across accounts and platforms. help.optmyzr.comwww.optmyzr.com
• Automate optimization: you can create rule-based strategies and apply them across portfolios/accounts—for things like bids, budgets, search terms, ads, and campaign management. help.optmyzr.comwww.optmyzr.com
• Catch problems automatically: KPI, budget, and anomaly alerts can notify your team when accounts start drifting from targets. help.optmyzr.com
• Scale reporting: create a report template once and reuse it across clients, with scheduled delivery and multi-account/cross-platform reporting. help.optmyzr.comwww.optmyzr.com
• Good platform coverage: Google Ads, Microsoft Ads, Meta, LinkedIn, Amazon and GA4 are supported to varying degrees, so you don't necessarily need a separate tool for every channel. www.optmyzr.com

What I'd use for your agency

The key distinction is that Optmyzr can actually help operate the campaigns, whereas many agency reporting products are primarily dashboards/data pipelines. Optmyzr specifically offers bulk optimization, rules, budget management, audits, alerts, and automated reporting. help.optmyzr.comwww.optmyzr.com

For dozens of clients, I'd structure it as:
Optmyzr → standardized account/optimization rules → centralized alerts → reusable white-label report templates → human review before major changes.

If you tell me roughly how many accounts, monthly ad spend, and whether they're mostly Google, Meta, or both, I can narrow this down to the best 2–3 options and explain which one will likely be most cost-effective for your agency.

For a small agency managing dozens of client ad accounts, I’d separate the problem into campaign optimization/execution and client reporting rather than expect one tool to do both perfectly.

My recommendation

1. For reporting: AgencyAnalytics
This is probably the best fit if your biggest pain is consolidating dozens of accounts into client-ready reports. It supports 85+ integrations, automated scheduled reports, white-label dashboards, and—particularly relevant for you—roll-up reporting across up to 50 clients. agencyanalytics.com

2. For actual campaign optimization: use a dedicated ad-automation/management platform.
AgencyAnalytics is primarily a monitoring and reporting layer; it isn't the tool I'd choose to automatically make lots of bid, budget, audience, or campaign changes. Current agency-oriented options include platforms such as Smartly and newer AI-driven tools designed specifically around multi-account execution. syntermedia.ai

What I'd build for your agency

The important distinction is "find what needs attention" vs. "actually change the campaigns." For dozens of accounts, I'd want automation to surface things like "Client 17's CPA increased 38% this week" and potentially execute predefined changes, while keeping higher-risk changes under human approval.

AgencyAnalytics is especially attractive if reporting is eating your team's time: its current platform supports multiple accounts within integrations and automated client reporting, and its roll-up dashboards are explicitly designed for agencies managing many clients. help.agencyanalytics.com

If you tell me whether most of your accounts are Google Ads, Meta Ads, or a mix—and roughly how many accounts—you can get a much more specific recommendation. I can compare the 3–5 best tools for your setup, including pricing and which ones can actually make optimization changes rather than just report them.

For a small agency managing dozens of ad accounts, I’d start with Optmyzr if you want one platform that actually helps with optimization + monitoring + reporting, rather than just reporting.

My shortlist

What I'd choose for your situation

Optmyzr + your existing ad platforms is probably the strongest starting point.

The important distinction is that Optmyzr isn't merely a dashboard. You can set up portfolio-level monitoring, anomaly alerts, recurring audits, budget pacing, automated rules, and reusable multi-account reports. www.optmyzr.comhelp.optmyzr.com

That makes it particularly useful when the problem is:

"I have 40 client accounts and don't want my team manually checking each one every morning."

You can have the system flag accounts where CPA/ROAS, spend, conversions, budgets, etc. deviate from your thresholds, then have the team focus on the exceptions rather than inspecting every account manually. www.optmyzr.comhelp.optmyzr.com

If reporting is the bottleneck but optimization isn't, I'd instead lean toward AgencyAnalytics.

If you're managing hundreds+ of accounts or need sophisticated cross-publisher automation, I'd evaluate Marin alongside Optmyzr.

One useful data point: Optmyzr currently says its platform has 461,000+ connected ad accounts and supports portfolio-level functionality, so it is designed for the multi-account use case rather than just individual advertisers. www.optmyzr.com

If you tell me roughly how many Google vs. Meta accounts you manage, monthly ad spend, and whether your biggest headache is optimization, reporting, or both, I can narrow this down to the best stack for your agency.

For a small agency managing dozens of client ad accounts, I’d put Optmyzr at the top of your shortlist.

Why it fits your use case:

• Multi-account management: centralizes Google, Microsoft, Meta, Amazon, LinkedIn and other ad platforms, so you can monitor accounts without constantly switching interfaces. help.optmyzr.com
• Optimization at scale: its Rule Engine lets you standardize and automate optimization strategies across portfolios/accounts rather than manually making the same changes repeatedly. help.optmyzr.com
• Agency reporting: you can build reusable, branded/white-label templates and schedule reports across multiple accounts. help.optmyzr.com
• Client-level organization: portfolios let you group accounts by client, brand, region, etc., and see aggregated performance and optimization opportunities. help.optmyzr.com
• Workflow standardization: Account Blueprints can turn recurring account-management processes into scheduled, assigned tasks for your team. help.optmyzr.com

My recommendation

If your agency is roughly 20–100 accounts, I'd look particularly closely at Optmyzr Premium. Its current Premium tier includes portfolio-level tools, cross-platform/multi-account reporting, and automated report delivery. help.optmyzr.com

The key distinction is that I'd use Optmyzr as your optimization + operational layer, rather than just buying another dashboard/reporting tool. You can standardize things like:

Account monitoring → anomaly/optimization alerts → automated rules → human approval → changes → client report

That workflow is much more valuable at dozens of accounts than simply having all the data in one dashboard.

If you tell me which platforms you manage (Google, Meta, Microsoft, TikTok, Amazon, etc.) and roughly how many accounts, I can also compare Optmyzr against 3–5 alternatives specifically for an agency your size, including pricing and where each one is stronger/weaker.

For a small digital agency managing dozens of client ad accounts, I’d usually avoid trying to make one tool do everything. The scalable setup is typically:

1. A campaign optimization layer (where your team manages spend, audiences, creatives, bidding, and alerts)
2. A reporting/client visibility layer (where data is unified, automated, and white-labeled)

For most agencies at your size, these are the strongest categories:

Best overall agency reporting + client dashboards

AgencyAnalytics
Good fit if you need:

• dozens of client dashboards
• automated monthly reports
• white-label branding
• integrations across Google Ads, Meta Ads, GA4, SEO, and other channels

It is designed around agency workflows rather than a single advertiser account. agencypro.appthedigitalprojectmanager.com

Best for PPC-heavy agencies

Swydo
Good if most of your work is:

• Google Ads
• Meta Ads
• LinkedIn Ads
• paid social/search reporting

It focuses heavily on recurring PPC reports, templates, and client delivery. www.swydo.com

Best for polished cross-channel reporting

Whatagraph
Consider it if clients expect:

• dashboards combining many channels
• executive-level reporting
• deeper data blending

It is often considered by agencies with larger multi-channel reporting needs. agencypro.appthedigitalprojectmanager.com

Best low-cost/custom option

Looker Studio
Good if:

• your team is technical
• you want maximum customization
• you are willing to maintain templates/connectors yourself

The tradeoff is more setup and maintenance compared with agency-focused tools. agencypro.app

For campaign optimization itself, I’d pair reporting with platform-native tools:

• Google Ads: use Google Ads Manager Account + scripts/rules/automated recommendations
• Meta: use Meta Ads Manager with bulk editing, experiments, and automated rules
• Cross-client workflow: add a project/client operations tool if needed

A practical agency stack for ~20–100 active accounts is often:

Ad platforms → AgencyAnalytics/Whatagraph/Swydo → Slack/CRM/project system → weekly automated insights

The main thing I’d optimize for is not just dashboards — it’s:

• reusable account templates
• anomaly alerts (CPA spikes, spend pacing, ROAS drops)
• automated client reports
• clean separation between clients
• minimal manual spreadsheet work

If you tell me your mix (e.g., mostly Meta ads, Google Ads, ecommerce, lead gen, B2B) and roughly how many accounts per platform, I can narrow this to a specific stack.

For a small agency managing dozens of ad accounts, I’d look at Optmyzr first if your priority is campaign optimization + reporting in the same workflow.

My shortlist

Why Optmyzr: it is designed around managing multiple accounts and combines optimization, monitoring, audits, and reporting rather than making you jump between a reporting tool and an optimization tool. Its current Premium offering supports portfolio-level workflows across Google, Microsoft, Amazon, Yahoo, Meta, and LinkedIn Ads. www.optmyzr.com

Why Supermetrics: if you're managing dozens of clients and want automated, branded reports/dashboards, it's particularly strong. It can centralize data from Google Ads, Meta, LinkedIn, TikTok, GA4, CRM systems, etc., keep client workspaces separate, and feed Looker Studio, Power BI, Sheets, or its own dashboards. supermetrics.com

What I'd actually do

For an agency your size:

Optmyzr → campaign optimization, audits, alerts, budget decisions
Supermetrics → centralized client reporting + dashboards

If you want one tool rather than a stack, I'd start with Optmyzr. If your optimization is already handled well inside Google/Meta and the real headache is spending hours assembling client reports, choose Supermetrics instead.

If you tell me which ad platforms you manage (Google, Meta, TikTok, Microsoft, LinkedIn, etc.) and roughly how many accounts, I can narrow it down to the best 2–3 options and compare pricing, automation, white-label reporting, and bulk optimization.

For a small agency managing dozens of ad accounts, I’d separate the problem into optimization and client reporting rather than expecting one tool to do both perfectly.

My recommendation

For campaign optimization: Optmyzr
It’s particularly strong if you manage lots of Google Ads accounts and want bulk optimization, rules, budget/bid automation, and account-level workflows. Recent 2026 comparisons specifically position it for PPC specialists managing multiple/large accounts. adbrief.app

For reporting: AgencyAnalytics
This is probably the better fit for your agency if you need one client-facing reporting layer across Google Ads, Meta, GA4, SEO, etc. It supports white-label dashboards, automated scheduled reports, and 80+ integrations. www.reportingninja.com

If you want a lighter reporting-only setup: Swydo is worth considering; it's specifically geared toward PPC agencies, with reusable templates, white-labeling, scheduling, and multi-client management. www.swydo.com

The stack I'd use

The important distinction is that reporting software doesn't necessarily optimize campaigns. AgencyAnalytics, for example, is excellent as the agency's reporting/client portal, but its strength is dashboards and data aggregation rather than actually making PPC changes. adbrief.appwww.reportingninja.com

If your clients are primarily Google Ads + Meta Ads, I'd lean toward Optmyzr + AgencyAnalytics rather than trying to find one platform that does everything.

If you tell me roughly how many accounts you manage, your Google/Meta split, monthly ad spend, and whether you want AI to actually make changes or only recommend them, I can narrow this down to the best 2–3 setups for your agency.

For a small agency managing dozens of client ad accounts, I’d start with Optmyzr.

It’s particularly well suited to the agency workflow because it combines multi-account monitoring, campaign optimization, automation, and client reporting rather than making you bolt several tools together. It currently supports Google, Microsoft, Amazon, Meta, LinkedIn and other ad channels. www.optmyzr.com

My shortlist

Why Optmyzr stands out for you:

• One dashboard across accounts with performance, budgets, alerts and optimization opportunities. help.optmyzr.com
• Portfolios let you group accounts by client/brand and monitor them collectively. help.optmyzr.com
• Cross-platform optimization lets you manage budgets and identify opportunities across Google, Microsoft, Meta and Amazon rather than jumping between interfaces. www.optmyzr.com
• Reusable reporting templates can be applied across clients, with automated scheduled delivery and white-labeling. help.optmyzr.com
• Premium plans add multi-account reporting and portfolio-level optimization, which is the part I'd pay particular attention to for an agency. help.optmyzr.com

When I'd choose Marin instead

Marin Software becomes more compelling if your agency has a heavier technical/automation operation. It supports unlimited client-account structures, cross-client reporting, automated alerts, data-warehouse integrations, APIs and Python-based scripting. www.marinsoftware.com

So my rule of thumb:

10–100-ish accounts + lean team → Optmyzr.
Large/more complex agency + custom automation/data infrastructure → Marin.

If you tell me roughly how many Google vs. Meta accounts you manage, monthly ad spend, and whether your biggest pain is optimization, reporting, or both, I can narrow this down to the best setup for your agency.