If you need complex forms you need WSForm

WSForm is by far the most powerful form tool for WordPress that I know of.
The builder is very good to use, the available conditions go far beyond what you are used to from the usual market solutions. Ingenious is the bidirectional sync with ACF which allows to dynamically create forms from ACF types.
Outstanding and not to be pointed out enough is the fast, uncomplicated and always solution-oriented support from Mark. Thanks for this great plugin which is worth every Euro!