Marktest is leading in Top 10K Sites and Top 100K Sites.
Marktest has better usage coverage in more websites categories. Including Arts & Entertainment, Newspapers, News & Media, TV & Video and one other category.
Visilabs is leading in Business & Industry, Sports, Cycling & Biking, Finance and one other category.
Marktest is leading in most countries, including Brazil, Portugal and Italy.
Visilabs is leading in Turkey.