Can Superman beat Goku?

Sure Superman is invincible and yeah Goku takes forever to level up, but there is a chance Goku could win! THE DRAGONBALLS! Goku could just gather them up over time and at the day of the battle just wish Superman to be defeated. There's also the slim chance that some other hero, *coughBatmancough* could give Goku some kryptonite (forgive my spelling) to defeat Superman. So with the dragonballs and kryptonite, Goku has a chance! GO GOKU!

Goku is overpowered

I mean COME ON! Goku can destroy entire planets, and take out the yellow sun, what is Superman? A NORMAL HUMAN! If Superman were on Goku's turf, he'd definitely be turned into a crumbling pile of ashes like the rest of humanity after the fight. Team Goku FOR THE WIN!!!

Goku can go the distance...

Superman's powers are set. Scaling only with time in the sun.
Goku gets stronger after each fight and has done so many times in the series.

Even as a boy, his power level at a very small fraction of what it is in his super saiyan god form, he was able to destroy a planet and move at light speed. He is now at a ridiculously higher power as an adult by millions of levels of magnitude in comparison. He is confirmed to be several times stronger than Broly who was able to take out a Galaxy rapidly due to that very saiyan nature.

He still has a long life ahead of him and his potential is limitless. He's also impossible to permanently kill, so even if Superman could beat him at his incredibly powerful current strength, he would only come back stronger.

It is also shown that the stronger he himself gets, the more efficient he is at gathering and utilizing spirit energy collected. Towards the end of GT, he was able to tap power from the entire multiverse in a matter of minutes. Superman may scale well with the power of a sun, but that is insignificant to the potential power that can be obtained from even one universe. Also, goku can absorb that energy for an extremely potent short burst of power. Combined with the incredibly precise, power focusing move of the super dragon fist, he should be able to utilize all of that incredibly energy combined with his own, into a single point, giving him the ability he needs to get through the tough durability of superman.

Superman can take very powerful, stronger than supernova blasts unfocused, but a power amount great enough to destroy a galaxy, further multiplied by a shared power of a multiverse, all focused on one small point, is a tier above even supe's durability.

And as strong as that is, Goku can still become even stronger with every battle. So when all cards are played, I have to give this to Goku.