Usablenet is leading in Top 100K Sites and Top 1M Sites.
w3roi has better usage coverage in more websites categories. Including Internet & Telecom, Business & Industry, Health, Computer & Electronics and 27 other categories.
Usablenet is leading in Shopping, Clothing, Consumer Electronics, Mobile Developers and 11 other categories.
Usablenet is leading in most countries, including United States, United Kingdom, Spain, Chile and 9 other countries.
w3roi is leading in Afghanistan, China, Netherlands, Turkey and 4 other countries.