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, People & Society, Shopping and 30 other categories.
Testnet is leading in Autos & Vehicles, Cooking & Recipes, Food & Drink, Beauty and 5 other categories.
Open AdExchange is leading in most countries, including Denmark, United Kingdom, United Arab Emirates, Sweden and 3 other countries.
Testnet is leading in Belgium.