In terms of market share, Observer is clearly lagging behind, losing to Vertster in all segments.
Observer has better usage coverage in more websites categories. Including Business & Industry, Arts & Entertainment, Internet & Telecom, Computer & Electronics and 28 other categories.
Vertster is leading in Computer Hardware, Agriculture & Forestry, Computer Security, Food & Drink and 4 other categories.
Observer is leading in most countries, including United States, Russia, China, Japan and 8 other countries.
Vertster hasn't got a lead over Observer in any country.