I love the sound and speed of classic, so voted for that one.
However, I am trying to give F3 a chance, but I am having problems with corner handling, spinning out on corners where I would never spin out in the higher classes, probably due to the extra down-force in those classes.
Perhaps I need to be more subtle with my right foot, or need a better linearity/saturation setting for the throttle pedal of my DFGT. Currently I have all aids off except that I appear to need 'Low' traction control enabled .....