C3 Metrics is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
C3 Metrics has better usage coverage in more websites categories. Including Arts & Entertainment, Travel, Business & Industry, Finance and 67 other categories.
ReferLocal is leading in Newspapers.
C3 Metrics is leading in most countries, including United States, Russia, France, Canada and 23 other countries.
ReferLocal hasn't got a lead over C3 Metrics in any country.