Optimatic is leading in Top 100K Sites and Top 1M Sites.
Tremor Media has better usage coverage in more websites categories. Including Arts & Entertainment, People & Society, News & Media, Music & Audio and 27 other categories.
Optimatic is leading in Games, Business & Industry, Internet & Telecom, Marketing & Advertising and 22 other categories.
Optimatic is leading in most countries, including United States, Israel, India, Venezuela and 20 other countries.
Tremor Media is leading in Japan, Australia, Brazil, United Kingdom and 7 other countries.