In terms of market share, Open AdExchange is clearly lagging behind, losing to Spark Studios in all segments.
Open AdExchange has better usage coverage in more websites categories. Including Business & Industry, Shopping, Sports, Travel and 13 other categories.
Spark Studios is leading in Arts & Entertainment, Animation & Comics, Basketball, Photography and one other category.
Open AdExchange is leading in most countries, including Denmark, Norway, Portugal, Sweden and one other country.
Spark Studios is leading in United States, Brazil, Poland and France.