I have also chosen the Glock Model 23 for concealed carry. If the poop ever hits the fan I am armed with arguably the best fighting handgun in the world, the Glock, in a caliber capable of mid 90's one shot stopping power. While I wouldn't feel underarmed with the model 23 by any means, if I could chose my handgun knowing in advance that trouble was comming, I would select my Glock model 21 in 45acp. Again the Glock pistol in any caliber should be considered tops in combat handguns, however my model 21 is the finest shooting combat handgun that I have had the pleasure of firing hands down, bar none, end of story. Why the Glock? Glocks are utterly reliable! I have, in 12 years of Glockin, never had a stoppage that wasn't faulty ammunition or magazine springs. The Glock has a consistent trigger pull everytime, eliminating the possiblity of stress oriented hi low shooting that hard & long double action trigger pull and the light and short single action followup shot causes. The Glocks trigger requires the least amount of foward travel to re cock making it the fastest for followup shots. The Glock has an extremely low bore axis, lower than any other combat handgun I have fired. This low bore axis reduces the muzzel flip also allowing the gun to remain closer to the intended target, meaning a faster followup shot. The Glock is capable of accuracy far greater than I am, so accuracy capability is as good as your abilities. The Glock is as tough as pig iron, far out classing many guns costing much more. The Tenifer finish on this handgun is the toughest I have ever seen and is reportedly salt water resistant. I can field strip the Glock in seconds and replace any broke part quickly and easily with one tool. The only catagory that Glock absolutly cannot compete is looks. It is one of the ugliest handgun on the market. But looks don't win gunfights.
To answer the question. I am wedded to the Glocks safe action for the reason described above. Caliber is not a concern of mine so long as it is capable of at least 90 percent one shot stops or better with quality ammo. In any "poop hit the fan" situation if given time to prepare the handgun will only be a backup to my main weapon the AR-15.