[Zope] GUF or MySQLUF?

Hi everyone, I have to decide which product to use to organise users' access using data from a MySQL database. As far as I can see I could use GenericUserFolder or MySQL UserFolder. Looking at the list it seems that GenericUserFolder is the one that's used more often and that's supported better. Or does it only make more trouble? I would be glad to receive some advice or get some comments. Ragnar