I've been using Youengage since the first day... I actually bought it when it was 4screens (engagenow and enagegeform). This new UI and UX are amazing.
I think that they grew up a lot doing the logic option, so you can create amazing, amazing polls, quizes and surveys.
I'm very happy that we're still having the event options. I used it with amazing results in my event. I created an amazing survey to understand what people wanted to know about. Amazing, amazing experience.
One of the best marketing options are the leads, which you'll have to create new lists for email marketing.
This is not only a survey creator, it's a complete lead creator, doing of Youenagage one of the best tools in terms of price-service.
The customer service is amazing and I'm sure that you won't have any problem. The whitelabel option is great and you'll love it too.
Rafael