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 44 other categories.
Open AdExchange is leading in Marketing & Advertising, Travel, Real Estate, Newspapers and 12 other categories.
Harren Media is leading in most countries, including Brazil, Mexico, Spain, Russia and 27 other countries.
Open AdExchange is leading in Denmark, Sweden, Romania and Malta.