Old thread but different strokes for different folks. We have a competitive shooter at my squadron, a Hornet pilot who uses only Sig, a Sig 226 to be exact and from what I hear, is one hell of a shooter. A few others compete, all use Glock. I love my Sigs and Glocks but if I had to compete, it would be a Glock but that's just me. They are a bit expensive as well and only the Sig 2022 and 250 are within range of your standard Glock.
-Glock Gen 4 G17/G19
-Sig P226 Navy/1911 TACOPS/M400
-Beretta Nano/Walther PPX/XDM 45