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 99 other categories.
Testnet is leading in Beauty and Beauty & Fitness.
SpotX is leading in most countries, including United States, Germany, Netherlands, United Kingdom and 47 other countries.
Testnet hasn't got a lead over SpotX in any country.