Marktest is leading in Top 10K Sites.
Vizu has better usage coverage in more websites categories. Including People & Society, News & Media, Arts & Entertainment, Technology News and 77 other categories.
Marktest hasn't got a lead over Vizu in any websites category.
Vizu is leading in most countries, including United States, India, Canada, Australia and 18 other countries.
Marktest is leading in Portugal.