This is actually a good comparison in terms of where they are at in their careers, both 29 years old, 10th NHL season, etc. The fact that you want Buff over Suter is atrocious but to each his own.
Buff is a career -46 player who has NEVER had a season where his +/- finished with +. He is a 0 this year so far, bet he finishes again below that mark.
Suter is a career +62 and has had one season where he finished with a - however.
Buff has had two seasons in his career where he averaged over 24 minutes/game (one was the lockout shortened year)
Suter has 6 seasons over 24 mins/game. Not counting 2009-2010 where his avg was 23:59.
These are defensemen after all and Suter has been the epitome of a top notch NHL defensemen.
Granted Suter played a bunch more games but hey, that doesn't mean anything other than he is flat out better. Buff is a much better goal scoring defensemen (by far) and I will admit it every time, but for the position they play, Suter is hands down a better option.
*Stats don't include playoffs