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WhosOn is leading in The Entire Web.
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Sailthru Horizon is leading in Top 10K Sites and Top 100K Sites.
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WhosOn has better usage coverage in more websites categories. Including Home & Garden, Finance, Computers Electronics & Technology, Health and 10 other categories.
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Sailthru Horizon is leading in News & Media, Food & Drink, Arts & Entertainment, Travel & Tourism and 6 other categories.
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WhosOn is leading in most countries, including United Kingdom, Canada, France, India and 36 other countries.
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Sailthru Horizon is leading in United States, Hungary, China, Romania and 10 other countries.