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 69 other categories.
Observer is leading in Marketing & Advertising, Web Design, Travel, Transportation & Logistics and 6 other categories.
Vizu is leading in most countries, including United States, India, Indonesia, Canada and 12 other countries.
Observer is leading in Russia, China, Japan, France and 3 other countries.