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 Food & Drink, Cooking & Recipes, Pets & Animals, Pets and 5 other categories.
Open AdExchange is leading in most countries, including Denmark, Sweden, Poland, Norway and 3 other countries.
Testnet is leading in Belgium, Netherlands and United Kingdom.