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, Shopping, People & Society, Internet & Telecom and 120 other categories.
Rekko is leading in Office Products, Food & Grocery Retailers, Furniture, Cooking & Recipes and 2 other categories.
Google Website Optimizer is leading in most countries, including United States, France, Russia, India and 77 other countries.
Rekko is leading in Guatemala.