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 46 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, United Kingdom, United States, Ireland and 39 other countries.
Observer is leading in Netherlands, Germany, Lithuania and Algeria.