Ad Butler is leading in Top 100K Sites and Top 1M Sites.
Ad Butler has better usage coverage in more websites categories. Including Business & Industry, News & Media, Arts & Entertainment, Sports and 95 other categories.
Tailsweep is leading in People & Society, Science, Social Sciences, Shopping and 22 other categories.
Ad Butler is leading in most countries, including United States, United Kingdom, Canada, India and 66 other countries.
Tailsweep is leading in Sweden, Spain, Germany, France and 9 other countries.