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 116 other categories.
Mass2 is leading in Car Buying, Furniture and Online.
Ad Butler is leading in most countries, including United States, United Kingdom, Canada, Mexico and 78 other countries.
Mass2 hasn't got a lead over Ad Butler in any country.