Marktest is leading in Top 10K Sites and Top 100K Sites.
Observer has better usage coverage in more websites categories. Including Business & Industry, Arts & Entertainment, Internet & Telecom, Computer & Electronics and 28 other categories.
Marktest is leading in Music & Audio, TV & Video, Soccer, Religion & Spirituality and one other category.
Observer is leading in most countries, including Russia, Germany, United States, Montenegro and 16 other countries.
Marktest is leading in Portugal, Brazil, Israel, Romania and one other country.