GSI Media is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Six Apart Advertising has better usage coverage in more websites categories. Including Arts & Entertainment, People & Society, News & Media, Computer & Electronics and 60 other categories.
GSI Media is leading in Children, Sports, Home & Garden and Adult.
Six Apart Advertising is leading in most countries, including United States, Germany, India, United Kingdom and 11 other countries.
GSI Media is leading in Canada, China and Switzerland.