In terms of market share, Observer is clearly lagging behind, losing to WebProspector in all segments.
WebProspector has better usage coverage in more websites categories. Including Finance, Reference Materials, Business & Consumer Services and Heavy Industry & Engineering.
Observer is leading in Computers Electronics & Technology.
WebProspector is leading in most countries, including Germany, Austria, Cyprus, Czech Republic and one other country.
Observer is leading in Russia and United States.