Which would be better for self defense a Beretta 92 or M1911?

The question is not complete, as caliber - and manufacturer, as concerns the M1911 -are not considered. Added: Personally I believe that the .45 caliber is a better man stopper round than the Beretta's 9 millimeter round. In the past I have carried the Mod 92 as an issued law enforcement service weapon. It is a MASSIVE pistol. The Mod 1911 Colt (or it's imitators) is also pretty hefty. If you are carrying it (legally, I hope) for self defense, neither of them are easily concealable. Most self defense shooting takes place well within 10 yards and both of the pistols you ask about are really too large for self defense carry. I would consider a smaller, more concealable pistol in either of those two calibers.