In terms of market share, Open AdExchange is clearly lagging behind, losing to Testnet in all segments.
Open AdExchange has better usage coverage in more websites categories. Including Business & Industry, Arts & Entertainment, Shopping, People & Society and 25 other categories.
Testnet is leading in Food & Drink, Cooking & Recipes, Soccer, Autos & Vehicles and 3 other categories.
Open AdExchange is leading in most countries, including Denmark, United States, Sweden, Italy and one other country.
Testnet is leading in Belgium.