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 74 other categories.
Usablenet is leading in Shopping, Clothing, Sports, Consumer Electronics and 10 other categories.
Vizu is leading in most countries, including India, Indonesia, Ukraine, Brazil and 17 other countries.
Usablenet is leading in United States, United Kingdom, Spain, Italy and 2 other countries.