Superman's power relies on the type of sun he's around I believe, and even if he gets more powerful by being near a stronger one Goku gains a more powerful move because he can drain the energy in the area.
X-Ray vision won't help the fight, and Goku can fly as well.
Superman may have lazer eyes, but Goku uses some pretty strong beams himself.
On top of this they both have inhuman strength, so they're pretty tough. But I think when it comes down to it, Goku has the upper hand.
And if worst comes to worst, he can just blow up the sun and instant transmission out of there.



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