Quigo AdSonar is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Shopzilla has better usage coverage in more websites categories. Including Shopping, Clothing, Consumer Electronics, Beauty & Fitness and 71 other categories.
Quigo AdSonar is leading in People & Society, News & Media, Arts & Entertainment, Business & Industry and 64 other categories.
Quigo AdSonar is leading in most countries, including United States, Canada, United Kingdom, Russia and 38 other countries.
Shopzilla is leading in France, Romania, Egypt, Turkey and 9 other countries.