Riddle is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Riddle has better usage coverage in more websites categories. Including Business & Industry, News & Media, Career & Education, Internet & Telecom and 75 other categories.
Zimbio is leading in Arts & Entertainment, People & Society, Music & Audio, TV & Video and 28 other categories.
Riddle is leading in most countries, including United States, United Kingdom, France, Germany and 38 other countries.
Zimbio is leading in Canada, Brazil, Spain, Australia and 27 other countries.