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Google Tag Manager vs IIS

Based on 2697 and 66 real audits

View Google Tag Manager details | View IIS details
MetricGoogle Tag ManagerIISWinner
Performance4145IIS
Accessibility8887Google Tag Manager
Best Practices8784Google Tag Manager
SEO9190Google Tag Manager
Security6666Tie
TTFB393ms513msGoogle Tag Manager
Composite7372Google Tag Manager
Performance
Google Tag Manager
41
IIS
45
Accessibility
Google Tag Manager
88
IIS
87
Security
Google Tag Manager
66
IIS
66
SEO
Google Tag Manager
91
IIS
90
Composite
Google Tag Manager
73
IIS
72

Google Tag Manager outperforms IIS in 5 of 7 categories, with a stronger composite score (73 vs 72). IIS leads in performance.

When to choose Google Tag Manager

Choose Google Tag Manager when your primary concern is server response time and best practices. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose IIS

Choose IIS when your primary concern is performance. Its audit data shows consistent strength in these areas across the sampled sites.

How this comparison was built

Scores are medians across 2697 audited Google Tag Manager sites and 66 audited IIS sites in the BeaverCheck database. Every audit runs the same 100+ checks — Lighthouse performance, security headers, accessibility, SEO, server response time — against a real URL. No vendor input, no sponsorship, no affiliate links. Read the full methodology →

FAQ

Which is faster, Google Tag Manager or IIS?
Based on real BeaverCheck audits, IIS sites score higher on Lighthouse performance (45 vs 41 on average).
Which has better security, Google Tag Manager or IIS?
Google Tag Manager sites score higher on security analysis (66 vs 66 on average).
Which has better accessibility, Google Tag Manager or IIS?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Google Tag Manager (88 vs 87). Both technologies can be made fully accessible with care — the difference reflects common patterns in the sampled sites, not inherent platform limits.
Which is better for SEO, Google Tag Manager or IIS?
Google Tag Manager sites score higher on Lighthouse SEO signals (91 vs 90 on average), which cover meta tags, crawlability, mobile friendliness, and structured data. Content strategy and backlinks still matter more than platform choice for ranking.
Which has faster server response (TTFB), Google Tag Manager or IIS?
Google Tag Manager sites show lower Time to First Byte (393 ms vs 513 ms on average). TTFB depends heavily on hosting and CDN setup rather than the technology itself, but the sampled sites suggest a meaningful difference in common deployment patterns.
Should I choose Google Tag Manager or IIS for my website?
Both platforms have trade-offs. IIS scores higher on overall composite score while Google Tag Manager may excel in metrics you care about most. Run a free BeaverCheck audit on a real site using each to compare the metrics relevant to your use case.
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