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 37 other categories.
Open AdExchange is leading in Shopping, Marketing & Advertising, Real Estate, Law & Government and 12 other categories.
Harren Media is leading in most countries, including Brazil, Mexico, Spain, Indonesia and 25 other countries.
Open AdExchange is leading in Denmark and Sweden.