well for me i figture it like this
if it a hand to hand, now powers used (enegry blast laser eyes, etc) goku will win because he got karate skills
superman hand to hand skills freakiing suck
(look at a superman cartoon where superman is fight someone to see what i mean) goku would dodge every punch superman throw, and beat his ass!!
if it a power only superman will win because he have more types of powers then goku. if goku instant trancemission
him to a or near a red sun they both would die from the sun's heat or from lack of oxygen, so goku can't really use that move
like that. all superman have to do is avoid the kamehameha and use ice breath to freeze goku then he...he
FIRE HIS LAZERS!!! to win
if they can use both powers and hand to hand combat then i guess uh don't really know who would win.