Eulerian is leading in Top 100K Sites and Top 1M Sites.
Eulerian has better usage coverage in more websites categories. Including Business & Industry, Finance, Financial Management, Shopping 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, United Kingdom, Germany and 20 other countries.
Observer is leading in Russia, Japan, Algeria, Greece and 2 other countries.