Usablenet is leading in Top 100K Sites and Top 1M Sites.
Yahoo Search Marketing Analytics has better usage coverage in more websites categories. Including E-commerce & Shopping, Lifestyle, Computers Electronics & Technology, Business & Consumer Services and 13 other categories.
Usablenet is leading in Food & Drink, Vehicles and Community & Society.
Yahoo Search Marketing Analytics is leading in most countries, including South Korea, Japan, China, Taiwan and 18 other countries.
Usablenet is leading in United States, United Kingdom, Chile, Philippines and one other country.