In terms of market share, Open AdExchange is clearly lagging behind, losing to Visible Measures 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.
Visible Measures hasn't got a lead over Open AdExchange in any websites category.
Open AdExchange is leading in most countries, including Denmark, Sweden, Italy and Guatemala.
Visible Measures is leading in United States, United Kingdom and Kenya.