Usablenet is leading in Top 100K Sites and Top 1M Sites.
Vizu has better usage coverage in more websites categories. Including People & Society, News & Media, Arts & Entertainment, Technology News and 68 other categories.
Usablenet is leading in Shopping, Consumer Electronics, Clothing, Recreation & Hobbies and 16 other categories.
Vizu is leading in most countries, including India, Canada, Germany, Australia and 12 other countries.
Usablenet is leading in United States, United Kingdom, Spain, France and 8 other countries.