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 86 other categories.
ReadZ hasn't got a lead over Ceros in any websites category.
Ceros is leading in most countries, including United States, United Kingdom, South Africa, Spain and 49 other countries.
ReadZ hasn't got a lead over Ceros in any country.