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, Accommodation & Hotels and 68 other categories.
ReferLocal is leading in Newspapers.
C3 Metrics is leading in most countries, including United States, Germany, Russia, Canada and 25 other countries.
ReferLocal is leading in Bolivia.