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 71 other categories.
Observer is leading in Marketing & Advertising, Transportation & Logistics, Programming, Car Buying and 4 other categories.
Vizu is leading in most countries, including United States, Indonesia, Canada, India and 18 other countries.
Observer is leading in United Kingdom, Ukraine, Netherlands, Finland and one other country.