Every plane will teach you something, so if you learn to fly both, you'll have more bases covered.

When I was learning, I began on a sim using a .40 trainer. The first real plane I flew was the SS. I flew on absolutely calm days and did not have any trouble flying the SS. It was nice that the SS flew much slower than the sim plane. It gave lots of time to think, which is necessary for those first few flights when poles & trees seem much closer or farther away than they are.

Flying a SS on a sim will give you an idea of how weird they can get in gusty, shifting winds.