Which is it please?

It's: Wein auf Bier das rat ich dir;
Bier auf Wein? Lass das sein!

Though there is some question whether the "Wein" doesn't actually refer to
rieslings and the like, but instead refers to "Weinbrand", which is brandy,
or other distillate.

Beyond that, the whole issue is highly disputed and has no basis in anything
objective :0)