Eulerian is leading in Top 100K Sites and Top 1M Sites.
Eulerian has better usage coverage in more websites categories. Including Business & Industry, Finance, Shopping, Financial Management and 53 other categories.
Observer is leading in Computer & Electronics, Internet & Telecom, Software, Marketing & Advertising and 10 other categories.
Eulerian is leading in most countries, including France, United States, Netherlands, United Kingdom and 15 other countries.
Observer is leading in Russia, Egypt, Switzerland and Haiti.