Marktest is leading in Top 10K Sites and Top 100K Sites.
w3roi has better usage coverage in more websites categories. Including Business & Industry, Internet & Telecom, Health, Computer & Electronics and 27 other categories.
Marktest is leading in Arts & Entertainment, People & Society, Music & Audio, News & Media and 3 other categories.
w3roi is leading in most countries, including United States, India, China, Canada and 8 other countries.
Marktest is leading in Portugal, Brazil, Israel, France and one other country.