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 30 other categories.
Testnet is leading in Autos & Vehicles, Pets, Pets & Animals, Cooking & Recipes and 5 other categories.
Open AdExchange is leading in most countries, including Denmark, Sweden, Slovakia and Guatemala.
Testnet is leading in Belgium.