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 101 other categories.
Vocus is leading in Software, Car Buying, Law, Products & Shopping and 11 other categories.
Ad Butler is leading in most countries, including United States, United Kingdom, Canada, Mexico and 70 other countries.
Vocus is leading in Ghana, Lao People's Democratic Republic and Malta.