OpinionLab is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.
Slice Factory has better usage coverage in more websites categories. Including People & Society, Arts & Entertainment, Computer & Electronics, Software and 52 other categories.
OpinionLab is leading in Business & Industry, Travel, Shopping, Tourism and 42 other categories.
OpinionLab is leading in most countries, including United States, Canada, United Kingdom, Russia and 50 other countries.
Slice Factory is leading in India, France, Sri Lanka, Ukraine and 12 other countries.