I have been using Jotform for over 10 years and in the past 2 years I tested 5 or more alternatives... because their service got worse and their product became buggy and I wanted to leave them.
Nothing came close to Jotform as far as building complex forms with intensive conditional logic, field, and email automation until FormDesigner.
IT HAS EVERYTHING
Their support is amazing .... (my currency was missing from their list for the payment gateway integration) They added it within 3 days.
Their pricing is great and I AM ALL IN
Highly recommend