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 Arts & Entertainment, Computer & Electronics, People & Society, Software and 16 other categories.
FredHopper is leading in most countries, including France, Netherlands, United Kingdom, Germany and 25 other countries.
Observer is leading in United States.