Usablenet is leading in Top 100K Sites and Top 1M Sites.
Usablenet has better usage coverage in more websites categories. Including Shopping, Business & Industry, Food & Drink, Food & Grocery Retailers and 30 other categories.
w3roi is leading in Internet & Telecom, Computer & Electronics, Marketing & Advertising, Career & Education and 18 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Spain, Italy and 11 other countries.
w3roi is leading in Turkey, China, India, Russia and 3 other countries.