Usablenet is leading in Top 100K Sites and Top 1M Sites.
WebProspector has better usage coverage in more websites categories. Including Business & Industry, Internet & Telecom, Marketing & Advertising, Computer & Electronics and 35 other categories.
Usablenet is leading in Shopping, Consumer Electronics, Sports, Food & Drink and 27 other categories.
WebProspector is leading in most countries, including Germany, Austria, Poland, Netherlands and 10 other countries.
Usablenet is leading in United States, United Kingdom, Spain, Peru and 5 other countries.