Bluemetrix is leading in Top 100K Sites and Top 1M Sites.
Bluemetrix has better usage coverage in more websites categories. Including Business & Industry, Shopping, Real Estate, Travel and 41 other categories.
Observer is leading in People & Society, Running, Web Design and Visual Arts & Design.
Bluemetrix is leading in most countries, including Japan, United Kingdom, United States, Ireland and 40 other countries.
Observer hasn't got a lead over Bluemetrix in any country.