GroupM Server is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
ReachLocal has better usage coverage in more websites categories. Including Business & Industry, Construction & Maintenance, Health, Autos & Vehicles and 119 other categories.
GroupM Server is leading in People & Society, Movies, Games, TV & Video and 14 other categories.
ReachLocal is leading in most countries, including United States, Australia, Canada, India and 60 other countries.
GroupM Server is leading in Poland, Germany, Denmark, Spain and 8 other countries.