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 52 other categories.
Observer is leading in Computer & Electronics, Internet & Telecom, Software, Marketing & Advertising and 11 other categories.
Eulerian is leading in most countries, including France, United States, Spain, Germany and 12 other countries.
Observer is leading in Russia, Ukraine, Australia, Argentina and 2 other countries.