Celtra is leading in Top 100K Sites and Top 1M Sites.
Celtra has better usage coverage in more websites categories. Including News & Media, Business & Industry, Marketing & Advertising, Computer & Electronics and 10 other categories.
SelectMedia is leading in Business News, Arts & Entertainment, Career & Education and Education.
Celtra is leading in most countries, including United States, Germany, China, Canada and 17 other countries.
SelectMedia is leading in Israel and Viet Nam.