It is my personal preference. Some years ago I tried HTML::FormFu and CGI::FormBuilder to see if they can help me with form handling. I was disappointed, because they wouldn't allow me to reduce amount of code or make it more clean comparing to what we had in our project. In fact I was disappointed so much, that when Gerda Shank released HTML::FormHandler, I ignored it for more than a year before giving it a try. And when I finally gave it a try I instantly liked it, it really does make things simple, concise and clean.
I don't want to pretend that I learned everything about HTML::FormFu and CGI::FormBuilder before giving up, and it is possible that they both improved a lot since I looked at them, but if you're looking for module to handle forms I would definitely recommend you to include HTML::FormHandler into list of modules to try.