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