Probably Broly, but it won't be easy.
broly
Broly would win in a fight of Super Android because he is much stronger.
SSJ 4 Broly.
Cell.
apocolypse
Vegito even in his Normal state.
broly
The X-men, assuming you mean all of them.
Jean Grey would win because if apocalypse is beating her to death, the phoenix will have to come out and save her
Broly. Even though he's a terrible fighter, he can beat pain.The Rinnigan won't work against him or any jutsu he used.
In actuality it would probably be superman, seeing as he is always "As strong as he needs to be..." Superman is also known as being the mans with "no Limits" so superman would be as strong as he is needed to be whenever in a fight. another point to put is that superman is not overrated, just overpowered given everything he could ever need to win.
Galactus.