Ceros is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Ceros has better usage coverage in more websites categories. Including Business & Industry, Arts & Entertainment, Shopping, Travel and 78 other categories.
Ion Interactive is leading in Games, Video Games, Career & Education, Education and 10 other categories.
Ceros is leading in most countries, including United States, United Kingdom, South Africa, Australia and 42 other countries.
Ion Interactive is leading in Taiwan and Estonia.