Optimatic is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Six Apart Advertising has better usage coverage in more websites categories. Including Arts & Entertainment, People & Society, News & Media, Humor and 48 other categories.
Optimatic is leading in Games, Video Games, TV & Video, Home & Garden and 6 other categories.
Optimatic is leading in most countries, including United States, United Kingdom, Israel, Canada and 8 other countries.
Six Apart Advertising is leading in Germany, Australia, Venezuela, Brazil and 6 other countries.