Both thoroughly enjoyable aeroplanes.
I think that if you have only flown the supercub of aircraft in that class, you probably do want an hour or two in the Chippie with somebody who knows the type well. The Gypsy Major is a different engine that needs a few points of understanding different to the Lycoming in the Cub.
Handling wise, both are good easy to fly, thoroughly enjoyable aeroplanes with adequate, if not sparkling, performance.
The view forward from the Chippie is more restrictive than the Cub, and certainly the view of pitch attitudes will be different also. Again a good reason to do an hour or two with somebody who knows the type well in the other seat.
But none of this should massively challenge a competent PPL.
G