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, Career & Education and 6 other categories.
Marktest is leading in People & Society, Music & Audio, Arts & Entertainment, Soccer and 3 other categories.
Vertster is leading in most countries, including United States, Australia, Malaysia and United Kingdom.
Marktest is leading in Brazil.