Superman VS Goku.

Okay, this may seem the most ridiculous post, but I couldn't help thinking about it after I watched my younger brothers (who shall be known as E and A on here because if I mentioned their names, they'd kill me) have a really stupid discussion.E thinks of himself as Superman,A thinks of himself as Goku,The reason for this?Because they believe that only Goku and Superman can be each other's rivals, and they want to be eternal rivals for eternity. Does it make sense? It depends on if you're a comic book and Anime(or Manga or both) fan or not. I personally am an Anime(& Manga) fan, but not a comic book fan. So I sorta understand their weird logic. However, what I don't get is why the hell they want to be epic rivals to each other. However, here is the question of the day.Who would win in a fight? Goku or Superman?