The single action triggers are superior IF they are already nicely tuned. They are not easy to tune without handfitting and or stoning them using special jigs.

The beretta trigger is very easy to tune. Pay about $3 for a spring from a model 96D, stone off the 'bruniton' goo from all of the contact parts between the hammer and trigger and it will shoot like a dream instead of a stiff nightmare.

As far as the 9mm vs .45 argument goes, its pretty much moot unless the shooter is is very good with handguns, which I doubt the average grunt would be. They both have fairly similar energy levels which aren't much. Its easier for a novice handgunner to shoot a 9mm than a .45 and get consistant hits. My only beef with the beretta is that it has a huge grip and the pistol itself is the exact same size as a full size 1911- its too big for a 9mm. I shoot both a beretta 92 and a 1911A1 competitively- the 1911 rocks, especially in games designed around the 1911, and the first shot is always faster than a double action. Where the beretta really shines is in a 'target rich' environment where the higher capacity magazine becomes a huge advantage.

As far as knockdown power goes with a pistol, the good Col Cooper said that anything worth shooting with a handgun, is worth shooting twice. Two .45 slugs in the chest or 2 9mm slugs in the chest, you aren't going to know the difference.