Marktest is leading in Top 10K Sites and Top 100K Sites.
Zeta Search has better usage coverage in more websites categories. Including Business & Industry, Finance, Internet & Telecom, Health and 20 other categories.
Marktest is leading in People & Society, Arts & Entertainment, Music & Audio, News & Media and 3 other categories.
Zeta Search is leading in most countries, including United States, Canada, Germany, India and 2 other countries.
Marktest is leading in Portugal and Brazil.