In terms of market share, Experian Marketing Services is clearly lagging behind, losing to Fathom SEO in all segments.
Experian Marketing Services has better usage coverage in more websites categories. Including Autos & Vehicles, Arts & Entertainment, Car Buying, People & Society and 27 other categories.
Fathom SEO is leading in Business & Industry, Health, Senior Health, Industrial Goods & Services and 10 other categories.
Experian Marketing Services is leading in most countries, including United States, Germany, Brazil, Canada and 17 other countries.
Fathom SEO hasn't got a lead over Experian Marketing Services in any country.