GLOCK 17 for pretty much everything. Competition, CC, OC. Wife has a M&P. I've owned a lot of handguns over the years and wind up selling most of them unless it has some personal significance to me. The G17 is the only one that's really hung in there. I tried to use a 1911 for CC and competition use........eh. For the size and heft I didn't feel like it was that good a deal. .45 vs 9mm can be debated till the end of time but it doesn't matter if it's .45 or 9mm you're still shooting a pistol round. Pick a common self defense caliber put quality ammo in it and call it day.