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 68 other categories.
Observer is leading in Web Design, Travel, Transportation & Logistics, Education and 5 other categories.
Vizu is leading in most countries, including India, United Kingdom, Canada, Brazil and 46 other countries.
Observer is leading in Montenegro, China, Belarus and Slovenia.