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, Shopping, Arts & Entertainment, Travel and 58 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, Belgium and 37 other countries.
ReadZ is leading in Bahrain.