Google Website Optimizer is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Google Website Optimizer has better usage coverage in more websites categories. Including Business & Industry, People & Society, Arts & Entertainment, Internet & Telecom and 67 other categories.
Rekko is leading in Shopping, Clothing, Food & Drink, Office Products and 18 other categories.
Google Website Optimizer is leading in most countries, including Germany, Brazil, France, India and 32 other countries.
Rekko is leading in United States, Canada, Martinique, Argentina and one other country.