Harren Media is leading in Top 1M Sites.
Harren Media has better usage coverage in more websites categories. Including Arts & Entertainment, People & Society, TV & Video, Movies and 36 other categories.
Open AdExchange is leading in Shopping, Marketing & Advertising, Real Estate, Newspapers and 12 other categories.
Harren Media is leading in most countries, including Spain, Brazil, Mexico, Canada and 22 other countries.
Open AdExchange is leading in Denmark, Netherlands, Guatemala, Italy and one other country.