The same question also applies to "how is WebEngage survey different from Qualaroo?"
Here's how we present our case:
1. WebEngage products can be "targeted" at certain audience segments based on a lot on in-built criterion like URL patterns, geography, cookies, traffic source etc - http://webengage.com/survey#targeting
3. WebEngage works via a JS widget code which is a one-time integration. All knobs and controls sit in the WebEngage Dashboard and for any new notifications or surveys that need to be run, customers don't need to change any code on their website.