Personally, I've used Typeform to a great extent, I like that it passes information in via the Forms API which is super useful when creating lists and filters, I can just sort by form submission. Another interesting one I've been playing with is Involve.me. It's a great forms tool and a really nice UX.
We used to use typform but they had a big data breach so we are no longer allowed to use them. Best alternative I have found is Google forms (and its free).