Nextag ROI Optimizer is leading in Top 100K Sites and Top 1M Sites.
WordStream has better usage coverage in more websites categories. Including Business & Industry, People & Society, Relationships & Dating, Autos & Vehicles and 54 other categories.
Nextag ROI Optimizer is leading in Shopping, Clothing, Marketing & Advertising, Home & Garden and 8 other categories.
WordStream is leading in most countries, including United States, Australia, India, Switzerland and 11 other countries.
Nextag ROI Optimizer is leading in Germany, United Kingdom, Canada, Taiwan and 4 other countries.