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 43 other categories.
Observer is leading in Internet & Telecom, Web Design, Visual Arts & Design and Running.
Bluemetrix is leading in most countries, including Japan, United Kingdom, United States, Ireland and 41 other countries.
Observer is leading in Algeria, Colombia and Argentina.