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, Arts & Entertainment and 44 other categories.
Observer is leading in Internet & Telecom, People & Society, Software, Web Design and 12 other categories.
Bluemetrix is leading in most countries, including Japan, United Kingdom, United States, Ireland and 38 other countries.
Observer is leading in Russia and Lao.