Harren Media is leading in Top 100K Sites and Top 1M Sites.
Harren Media has better usage coverage in more websites categories. Including Arts & Entertainment, People & Society, TV & Video, Movies and 42 other categories.
Simple AdServer is leading in Sports and Motorsports.
Harren Media is leading in most countries, including Spain, Brazil, Mexico, Canada and 25 other countries.
Simple AdServer is leading in Hungary.