AdBuyer.com is leading in Top 100K Sites and Top 1M Sites.
Vocus has better usage coverage in more websites categories. Including Business & Industry, Arts & Entertainment, People & Society, Health and 71 other categories.
AdBuyer.com is leading in Shopping, Career & Education, Education, Car Buying and 25 other categories.
Vocus is leading in most countries, including United States, United Kingdom, Canada, India and 27 other countries.
AdBuyer.com is leading in Israel, Norway, Hong Kong, Thailand and 8 other countries.