In terms of market share, ReferLocal is clearly lagging behind, losing to Simple AdServer in all segments.
ReferLocal has better usage coverage in more websites categories. Including Business & Industry, News & Media, Internet & Telecom, People & Society and 8 other categories.
Simple AdServer is leading in Computer & Electronics, Adult, Sports, Shopping and 5 other categories.
ReferLocal is leading in most countries, including United States, China and Japan.
Simple AdServer is leading in Pakistan and Croatia.