In terms of market share, Observer is clearly lagging behind, losing to Vizu in all segments.
Vizu has better usage coverage in more websites categories. Including People & Society, News & Media, Arts & Entertainment, Technology News and 72 other categories.
Observer is leading in Marketing & Advertising, Programming, Transportation & Logistics, Running and 4 other categories.
Vizu is leading in most countries, including United States, India, Indonesia, Poland and 17 other countries.
Observer is leading in Russia, Netherlands, Ukraine, Turkey and 3 other countries.