FredHopper is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
FredHopper has better usage coverage in more websites categories. Including Shopping, Business & Industry, Clothing, Home & Garden and 21 other categories.
Observer is leading in Computer & Electronics, Arts & Entertainment, Internet & Telecom, People & Society and 21 other categories.
FredHopper is leading in most countries, including France, United Kingdom, Netherlands, Germany and 26 other countries.
Observer is leading in United States, Russia, Brazil, Lao and one other country.