Torri Hunter what year? If you're talking 38 year old Lofton and Torii Hunter now, I'd say it's a toss up. I remember seeing Kenny Lofton in 2007, when he was in his 40's and he could still run the ball down out there. Obviously, I'd expect Bonds' numbers to be worse than either one, even though he was playing left field which has a different zone rating system than centerfield.
Like I said, UZR has some flaws, especially with outfielders. But what's the alternative?
What do YOU use for defensive stats, fielding percentage?