Celtra is leading in Top 100K Sites and Top 1M Sites.
Celtra has better usage coverage in more websites categories. Including Computer & Electronics, Business & Industry, Marketing & Advertising, Soccer and 11 other categories.
SelectMedia is leading in News & Media, Career & Education, Education, Business News and one other category.
Celtra is leading in most countries, including United States, United Kingdom, Germany, Colombia and 12 other countries.
SelectMedia is leading in Turkey, Argentina, India, Indonesia and 2 other countries.