TruEffect is leading in Top 100K Sites and Top 1M Sites.
Yahoo Search Marketing Analytics has better usage coverage in more websites categories. Including Business & Industry, Shopping, Internet & Telecom, Arts & Entertainment and 80 other categories.
TruEffect is leading in News & Media, People & Society, Performing Arts, TV & Video and 14 other categories.
Yahoo Search Marketing Analytics is leading in most countries, including United States, Japan, Taiwan, Korea Republic and 33 other countries.
TruEffect is leading in Guam, Ireland, Cote d Ivoire, Morocco and 4 other countries.