Marktest is leading in Top 10K Sites and Top 100K Sites.
Marktest has better usage coverage in more websites categories. Including People & Society, Arts & Entertainment, Music & Audio, News & Media and 6 other categories.
PublishFlow hasn't got a lead over Marktest in any websites category.
Marktest is leading in most countries, including Portugal, Brazil and United Kingdom.
PublishFlow is leading in Canada.