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, Shopping, Internet & Telecom, Travel and 17 other categories.
Testnet is leading in Autos & Vehicles, Pets & Animals, Automotive Industry and Pets.
Open AdExchange is leading in most countries, including Denmark, Guatemala, Dominican Republic, Sweden and one other country.
Testnet is leading in Belgium and Netherlands.