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, Computer & Electronics, People & Society and 23 other categories.
Vertster is leading in Computer Hardware, Food & Drink, Search Engine, Relationships & Dating and 5 other categories.
Observer is leading in most countries, including United States, United Kingdom, Russia, Germany and 7 other countries.
Vertster is leading in Australia and Canada.