Marktest is leading in Top 10K Sites and Top 100K Sites.
YellowTracker has better usage coverage in more websites categories. Including Business & Industry, Arts & Entertainment, People & Society, Shopping and 36 other categories.
Marktest is leading in Newspapers.
YellowTracker is leading in most countries, including Netherlands, Belgium, United States, Germany and 9 other countries.
Marktest is leading in Portugal and Brazil.