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GroupM Server is leading in The Entire Web.
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C3 Metrics is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
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C3 Metrics has better usage coverage in more websites categories. Including Health, Travel, Accommodation & Hotels, Shopping and 52 other categories.
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GroupM Server is leading in Arts & Entertainment, People & Society, Business & Industry, Internet & Telecom and 44 other categories.
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GroupM Server is leading in most countries, including Germany, Poland, Denmark, United Kingdom and 34 other countries.
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C3 Metrics is leading in United States, Russia, Norway, Canada and 20 other countries.