Usablenet is leading in Top 100K Sites and Top 1M Sites.
Usablenet has better usage coverage in more websites categories. Including Shopping, Business & Industry, Sports, Arts & Entertainment and 19 other categories.
w3roi is leading in Internet & Telecom, Computer & Electronics, Health, Marketing & Advertising and 19 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Spain, Chile and 8 other countries.
w3roi is leading in China, Russia, India, Korea Republic and 5 other countries.