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 26 other categories.
Testnet is leading in Beauty, Food & Drink, Cooking & Recipes, Soccer and 3 other categories.
Open AdExchange is leading in most countries, including Denmark, Norway, Sweden and United Kingdom.
Testnet is leading in Belgium.