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[DC] [DBZ] What if baby Kal-El's and Kakarot's pods pass into black holes simultaneously and pop out in each other's universes, with the Grandpa Gohan and the Kents raising them respectively?
gpt
Depends on if goku hits his head or not, if he doesnt well then he will do as most sayians babies do and try to take over the planet. Due to the high number of superpowered people there, and the lack of people to teach him ki, he wont get very far. If he hits his head and becomes good, the kents will raise him to be a good boy, and avoid fighting, so he wont get much training done and just go on to be a moderate powerful dude with your standard superstright and durability that maybe becomes a superhero. He wont have his normal drive to always become stronger, so he will probably just stay on something like city tier for a while unless he gets some zenkis. 

Superman, however, as soon as his powers start to kick in, he will quickly be the most powerful being on earth, and all of db's villians and most of the early dbz villians will quickly lose to him, but since his powers cant increse like gokus, he will sooner or later be left behind, barring momentarily using sundipping. Due to his own powers, he wont really have a reason to learn that much of ki. He will learn a bit from gohan and roshi, and due to being raised by them he will be much more about fighting than he ususally is, but since he will eaisly be the most powerful dude around he will probably not train much, and wont learn much about ki except what he learned as a child before his powers kicked in. its possible that when he starts to fall behind the villians that appear, that he starts to train with ki again to catch up, but then he will be very far behind the others, and will have trouble catching up. And that is if he survives his first fight with the villian more powerful than him. If that is freeza, he wont survive. If that is cell, he might survive, cell was rather bad at finish off people. Buu i dont know much about. (im not gonna arguge which villian will defeat superman, but i think is how they would react if they did)