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, News & Media and 63 other categories.
Marktest hasn't got a lead over YellowTracker in any websites category.
YellowTracker is leading in most countries, including Netherlands, Belgium, United Kingdom, Poland and 16 other countries.
Marktest is leading in Brazil.