DoubleClick Spotlight is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Mediaplex has better usage coverage in more websites categories. Including Arts & Entertainment, People & Society, Shopping, News & Media and 153 other categories.
DoubleClick Spotlight is leading in Autos & Vehicles, Business & Industry, Car Buying, Travel and 58 other categories.
Mediaplex is leading in most countries, including United Kingdom, France, Germany, India and 88 other countries.
DoubleClick Spotlight is leading in United States, Canada, Japan, Spain and 51 other countries.