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 Motorsports and Sports.
Harren Media is leading in most countries, including Brazil, Mexico, Spain, Indonesia and 26 other countries.
Simple AdServer is leading in Hungary.