Marktest is leading in Top 10K Sites and Top 100K Sites.
w3roi has better usage coverage in more websites categories. Including Internet & Telecom, Business & Industry, Health, Computer & Electronics and 27 other categories.
Marktest is leading in People & Society, Music & Audio, News & Media, Newspapers and 2 other categories.
w3roi is leading in most countries, including United States, China, Viet Nam, Russia and 6 other countries.
Marktest is leading in Portugal.