I carried a Colt Commander Light Weight for years but always had trouble in the summer months with keeping it concealed. I had one of the early custom jobs till the rail cracked and then went to a Detonics .45 for a while. When Colt came out with their cut down I went to it, but didn't feel I was getting the accuracy necessary. I tried the small SIG when it came out but was always less proficient with it based on how it fit my hand. I settled on first the Glock 30 and later the 36 (especially in the summer) but have just switched to Springfield Armory's XD-S and now have the gun I wish I'd had when I started carrying in 1970.
The pattern? They were all .45ACP. Having had the experience of seeing the effect of 9MM, or lack thereof, on live targets, I would much rather carry a .45. If it was not a concealed situation, I would rather have a short barrel (but legal) 12 gauge.
I don't want to kill anyone but I do want them to stop doing what they were doing when it made it legal for me to shoot them, and I want them to do it immediately. I would rather not be shot again.