In terms of market share, Marktest is clearly lagging behind, losing to PublishFlow in all segments.
Marktest has better usage coverage in more websites categories. Including People & Society, Arts & Entertainment, Music & Audio, TV & Video and 5 other categories.
PublishFlow hasn't got a lead over Marktest in any websites category.
Marktest is leading in most countries, including Brazil and Portugal.
PublishFlow is leading in Canada.