DiabloFans

I voted Baal, because he was very tough to me. I think he has great knowledge too.

diablo, aka the puppy, would bone prison mephy and it would be over

Baal would be a little bit longer fight because of his HP and can tele out of prison but is weak and would get melted by the puppy's pretty pink lightning

Mephisto is the oldest and is the smartest. So I voted for him.

I'm not sure who would win Diablo vs baal.

I would say Baal. He does control the worldstone, after all.

But he would need to be in the World Stone Chamber to do that, and it doesn't actually grant him power, if I remember correctly, since he isn't tied to it. He was only using it to break the barriers between the worlds (or atleast that's what the in-game content suggested.)