Who would win in a fight Superman or darkseid?
Superman would not win in a fight to the death, Superman is not immortal, and whatever you watch on cartoons and or any other source but the source itself (Comics) Darkseid would win since he is a New God, for one, for two, he is truly Immortal, unlike superman who is not, who can be taken down. He just has a longevity on earth due to the Yellow Sun. Also, Darkseid has no physical weakness known in the comic book worlds, they just portray superman as the victor due to good guys always win tactic.
So the answer is Darkseid