Usablenet is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Usablenet has better usage coverage in more websites categories. Including Business & Industry, Shopping, People & Society, Travel and 44 other categories.
w3roi is leading in Internet & Telecom, Health, Computer & Electronics, Career & Education and 22 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Japan, Spain and 11 other countries.
w3roi is leading in China, Viet Nam, Russia, Philippines and 6 other countries.