Marktest is leading in Top 10K Sites and Top 100K Sites.
Marktest has better usage coverage in more websites categories. Including Arts & Entertainment, Music & Audio, People & Society, Newspapers and 2 other categories.
Zeta Search is leading in Finance, Health, Financial Management, Banking and 2 other categories.
Zeta Search is leading in most countries, including United States, Canada, India and Serbia.
Marktest is leading in Brazil, Portugal and Morocco.