Bluemetrix is leading in Top 100K Sites and Top 1M Sites.
Bluemetrix has better usage coverage in more websites categories. Including Business & Industry, Real Estate, Shopping, Travel and 47 other categories.
Observer is leading in Internet & Telecom, People & Society, Software, Web Design and 11 other categories.
Bluemetrix is leading in most countries, including Japan, Great Britain, Ireland, United States and 35 other countries.
Observer is leading in Russia, Germany, Netherlands, Montenegro and 5 other countries.