Experian Marketing Services is leading in Top 100K Sites and Top 1M Sites.
Experian Marketing Services has better usage coverage in more websites categories. Including Autos & Vehicles, Arts & Entertainment, Car Buying, People & Society and 23 other categories.
Fathom SEO is leading in Business & Industry, Health, Senior Health, Industrial Goods & Services and 11 other categories.
Experian Marketing Services is leading in most countries, including United States, Brazil, United Kingdom, Canada and 14 other countries.
Fathom SEO hasn't got a lead over Experian Marketing Services in any country.