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, Consumer Electronics, Gifts and 6 other categories.
Vizu is leading in most countries, including India, Indonesia, Canada, Ukraine and 10 other countries.
Usablenet is leading in United States, United Kingdom, Italy, Spain and 4 other countries.