Marktest is leading in Top 10K Sites and Top 100K Sites.
Vertster has better usage coverage in more websites categories. Including Computer & Electronics, Computer Hardware, Internet & Telecom, Womens Interests and 8 other categories.
Marktest is leading in People & Society, Arts & Entertainment, Music & Audio, Sports and 3 other categories.
Vertster is leading in most countries, including Australia, United States, Canada and Portugal.
Marktest hasn't got a lead over Vertster in any country.