Korrelate is leading in Top 100K Sites and Top 1M Sites.
Shopzilla has better usage coverage in more websites categories. Including Shopping, Arts & Entertainment, Computer & Electronics, Consumer Electronics and 42 other categories.
Korrelate is leading in Autos & Vehicles, Car Buying, Automotive Industry, Business & Industry and 14 other categories.
Shopzilla is leading in most countries, including Canada, Russia, United Kingdom, Germany and 15 other countries.
Korrelate is leading in United States, Mexico, Chile, Taiwan and 10 other countries.