I’m not an affiliate of Gravity Forms and I’m sorry if this offends someone, but based on my own custom form development experiences I can recommend it.
Gravity Forms has very good API documentation that helps when customizing forms. For example on one site I used Advanced Custom Fields metafields as Gravity Forms radio field options.
Gravity Forms also has different hooks you can use to manipulate form entries before/after the form/email notifications are saved/sent.
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