Who would win? GOKU? OR SUPERMAN? GOKU VS SUPERMAN!!?

Keep in mind, Superman is really strong but Goku has the ability to double, triple,quadruple his strength and we don't really know the limits of a saiyan. Nor do we know of Superman's full strength since he seldom uses it. But if superman got tired in a fight he's done. And goku can go super duper big monkey on him. what do u think?