Marktest is leading in Top 10K Sites and Top 100K Sites.
Vertster has better usage coverage in more websites categories. Including People & Society, Internet & Telecom, Womens Interests, Relationships & Dating and one other category.
Marktest is leading in Newspapers, News & Media, TV & Video and Arts & Entertainment.
Vertster is leading in most countries, including South Africa, Ghana, China and Canada.
Marktest is leading in Portugal.