we should definitely use SSG Goku.
I'd propose sticking to Z. It's probably the most well known.
I'm not sure which Superman we should use
My thoughts, assuming Goku from the end of Dragonball Z:
Adventures of Superman, Superman: Even Krillan could beat him.
Justice League Superman: Goku wins, Superman gives a 'world of cardboard speech' and fights more seriously, punches Goku through a couple buildings. Goku, accustomed to being smashed through mountains and repelling planet-bursting attacks, is unphased by this and beats him anyway.
Christopher Reeves Superman: Goku wins if we judge based solely on fighting capabilty, strength, durability, etc. But this version of Superman has some Silver Age trump cards that enable him to win without fighting, like reversing time, being able to selectively erase memories, etc.
Smallville Superman: Goku wins. Pushing Apokalips away from earth is impressive, but it's the standard "ignore mass"/"contact telekinesis" ability that Superman has in most media. If he were actually applying enough
force to move the planetoid to move it away from earth, he would simply have poked a hole and flown through it rather than move the whole thing. Even if he were distributing the force over much greater surface are than just his hands, it would still have crushed in on itself in the process. It didn't. It never does. This is one of Superman's signature abilities, moving around planes, buildings, planets, etc. without causing any damage to them in the process. But
not damaging a thing isn't the greatest combat skill.
Superman returns/Man of Steel: I don't remember many notable feats from these movies besides the bullet to the eye scene. Might need to watch them again, but I think Goku still wins.
Comic books superman: Superman
sneezes and all the planets in the solar system that Goku is in disintegrate. Goku dies and takes the opportunity to catch up with the North Kaio, meets up with Piccolo and Bulma, summons the dragon and wishes all the planets back. Annoyed by this, Superman
goes back in time and reverts the change. Unable to make the same wish a second time, but not very inconvenienced by being dead, Goku tracks down Superman and challenges him to a fair fight. Superman decides that Goku is so weak that for the fight to be fair, he can't fight Goku himself. So he conjures up a
Super midget from his hand to fight on his behalf. That fight takes 15 episodes, but Superman gets bored watching and uses his
Super Kiss ability to make Bulma fall in lust with him to prevent the Z-team from locating the dragonballs again. Bulma falls for Superman hard, and chases him to the end of the galaxy. At least until he gets annoyed and uses his
Super Mind Control to make her go away. Meanwhile, Goku has finally defeatedthe Super midget, Krillan tosses him a senzu bean, leaving him replenished but his shirt is still torn. After tracking down Superman yet again. Superman conjures up another Super Midget but Goku, 3 times as strong as he was during the first encounter,is now able to effortlessly beat it. Superman, annoyed by this, Superman uses his
Super Fast Thinking to realize that this will keep going on forever if he doesn't put a stop to it. So he uses his
Super Domestic Skills power to cook up some delicious ramen, feeds it to Goku who then forgives him for destroying the solar system and killing billions of people and then promptly forgets about the whole thing. Not content with this, the writer for Superman makes up a
Super Make Goku Lose ability, and therefore Goku loses.
But yeah, set aside the comics and look at almost any other medium Superman has appeared in, Goku wins.