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, Norway, Sweden, Canada and 8 other countries.
Visible Measures is leading in United States.