Marktest is leading in Top 10K Sites and Top 100K Sites.
TruEffect has better usage coverage in more websites categories. Including News & Media, People & Society, Business & Industry, Arts & Entertainment and 44 other categories.
Marktest is leading in Music & Audio, Newspapers and Soccer.
TruEffect is leading in most countries, including United States, United Kingdom, Italy, Japan and 15 other countries.
Marktest is leading in Portugal.