A homicidal Juice head or a cliniclly depressed steel man. Lets take a look at both character's lives. Bane, born in a prison forced to live out a life sentence for his father. Became test subject, nearly died, became world class hired killer, rich, broke Batman.
Colossus, born in russia, mutant, came to X-Men, hooked up with Kitty. Lost Kitty. Nearly whole family dead or crazy. Decendant of Rasputin, died, reanimated by alien, expieramented on and torchered for three or four years non stop. Set free, back with Kitty. Banged her through the floor. Still cucoo in the head.
I'm gonna go with Bane.
Edit that, I'll go with Colossus. Bane spent nearly his entire life in jail. An not just a regular prison, a freakin 3rd world prison. No telling what his life was like there.