Come on its so obvious, anyone who cant see it really isnt a Disney fan, the obvious winner is Hades, and heres why
1. hes a god he cant die
2. if you watched the film you would relies that Hercules (b4 becoming a god) couldn't even hit him.
3. the only person with a chance is an idiot who was outsmarted by Aladdin.
Not convinced?
here are some facts, maleficent was beaten and killed by 1 guy with a sword (no powers),
Hades was beaten by Hercules a guy with a sword, but has super strength and at that point was a god, not to mention he defeated all the titans too, also this didnt kill Hades,
Chernabog is beaten by church bells, hes not going to be a problem,
jafar was outsmarted very easily, but he is the biggest competition due to him being a genie, however I think he can actually die, also if he was released from the lamp he would have decreased power like the other genies.
so heres what could happen, Hades just needs to keep attacking maleficent untill she dies, maybe he uses a sword whatever, all we know is she cant kill him
For Chernabog he just uses church bells, not difficult
Now jafar, either he kills him over time, or he simply stats, "well you may be a genie, but your no god" jafar then makes a deal with hades, and now hades has jafar as a little slave forever.