Who's more mentally unstable?

[Hopefulsuicide]

If they really opened the boys up, who do you think would reveal to be the bigger mess?

Dean - always pushing his emotions down, much deeper daddy issues that sam, went to hell and back, constant feelings of betrayal from his brother, very rigid set of principals/rules etc

Sam - forced to drink demon blood as a baby, rebellious to the point where he caused the apocolypse because he wouldn't do as he was told, addicted to demon blood and/or power, anger issues etc

[Tartfox]

Hmm, I'd say Dean. He's got alot of emotions bottled up inside while Sam is known for expressing himself. So I think Dean has alot more weight on his shoulders, Sam's more liberated.