In terms of market share, ReferLocal is clearly lagging behind, losing to Shopzilla in all segments.
Shopzilla has better usage coverage in more websites categories. Including Shopping, Arts & Entertainment, Computer & Electronics, Food & Drink and 12 other categories.
ReferLocal is leading in News & Media.
Shopzilla is leading in most countries, including United States, Canada, Russia, United Kingdom and 23 other countries.
ReferLocal hasn't got a lead over Shopzilla in any country.