Marktest is leading in Top 10K Sites and Top 100K Sites.
Vertster has better usage coverage in more websites categories. Including Computer & Electronics, Internet & Telecom, Computer Hardware, Search Engine and 9 other categories.
Marktest is leading in People & Society, Arts & Entertainment, Music & Audio, News & Media and 5 other categories.
Vertster is leading in most countries, including Australia, China, United Kingdom and United States.
Marktest is leading in Portugal.