Atlas is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Yahoo Ad Exchange has better usage coverage in more websites categories. Including Arts & Entertainment, People & Society, Internet & Telecom, Web Hosting and 123 other categories.
Atlas is leading in News & Media, Computer & Electronics, Software, Travel and 88 other categories.
Atlas is leading in most countries, including United States, United Kingdom, France, Brazil and 140 other countries.
Yahoo Ad Exchange is leading in Russia, Japan, Taiwan, Indonesia and 20 other countries.