Marktest is leading in Top 10K Sites and Top 100K Sites.
Vizu has better usage coverage in more websites categories. Including People & Society, Arts & Entertainment, Music & Audio, Food & Drink and 31 other categories.
Marktest is leading in Newspapers.
Vizu is leading in most countries, including United States, Indonesia, Netherlands, Russia and 17 other countries.
Marktest is leading in Portugal and Brazil.