Glock
I prefer the .45 for various reasons..........#1..ammo availabilty..tons of military surplus of .45 everywhere, so if things ever get tight i should be able to find plenty...#2...45 has adequate stopping power withoout overpenetration...#3..I already have a 9mm..just in case 45 gets scarce.... #10 mm an overpenetrate and has a bit more recoil than either the 9 or 45, hence a bit more of a delay between follow up shots. Each to his own of course, The .45 just has these advantages over the other calibers IMHO.