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, Computer Security and 8 other categories.
Marktest is leading in People & Society, Arts & Entertainment, Music & Audio, News & Media and 5 other categories.
Marktest is leading in most countries, including Portugal.
Vertster hasn't got a lead over Marktest in any country.