SpotX is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
SpotX has better usage coverage in more websites categories. Including News & Media, Arts & Entertainment, Autos & Vehicles, Car Buying and 94 other categories.
Visible Measures hasn't got a lead over SpotX in any websites category.
SpotX is leading in most countries, including United States, Netherlands, Germany, United Kingdom and 47 other countries.
Visible Measures is leading in Kenya.