Usablenet is leading in Top 100K Sites and Top 1M Sites.
Usablenet has better usage coverage in more websites categories. Including Business & Industry, Shopping, Arts & Entertainment, Consumer Electronics and 30 other categories.
w3roi is leading in Internet & Telecom, Computer & Electronics, Health, Marketing & Advertising and 22 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Spain, France and 13 other countries.
w3roi is leading in China, India, Taiwan, Azerbaijan and 3 other countries.