FredHopper is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
FredHopper has better usage coverage in more websites categories. Including Business & Industry, Shopping, Clothing, Home & Garden and 23 other categories.
Observer is leading in Computer & Electronics, Arts & Entertainment, Internet & Telecom, People & Society and 22 other categories.
FredHopper is leading in most countries, including France, United Kingdom, Netherlands, Germany and 24 other countries.
Observer is leading in Russia, Brazil, Mexico, Argentina and 2 other countries.