That's like saying would you rather die by electrocution or lethal injection. Either way, you're still dead!
In the past (60's), the far left has been known to get violent. But in recent years, the real violent domestic terrorists are on the far-right. In fact, they're so far out there, I'm not even sure its fair to call them right.
Pro-Life is a conservative 'right' position.
ELF and the environment is 'left' position.
Sure the pro-environment movement in the extreme has lead to the loss or property. And getting doused in paint by Peta certainly ruins a night out, however... when you're talking about shooting people dead because you disagree with them, the far-right (in past 2 decades anyway) has the body count.
I would not call Timothy McVeigh left or right, nor would I call the Unabomber left or right. These extremes have to be defined as Anti-establishment, anti-American. They believe in nothing except themselves and their own limited world view.