FredHopper is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Observer has better usage coverage in more websites categories. Including Computer & Electronics, Arts & Entertainment, People & Society, Internet & Telecom and 19 other categories.
FredHopper is leading in Shopping, Business & Industry, Clothing, Home & Garden and 17 other categories.
FredHopper is leading in most countries, including France, United Kingdom, Netherlands, Germany and 22 other countries.
Observer is leading in United States and Russia.