In a situation like that, definitely alone. My closest family wasn't "total trailer trash out of control" by any stretch of the imagination, but still dysfunctional in many ways. I currently live alone for studies a few hours away from where I was brought up, and while I miss most of the rest of my kin, being physically apart from my mom and pops feels good. Peaceful, even.
---------- Post added 2013-01-13 at 02:38 PM ----------
Well, personally I only voted "alone" under those specific premises and the assumption that you can still meet other people outside of your family. No other people at all, however? In that scenario, I wouldn't be able to decide which is worse.