i have no issues with 9mm, im not someone who looks at the size of the two and assume the bigger one is more powerful because im intelligent enough to know the 45acp is incredibly low pressured by comparison so its not nearly as powerful as its size may suggest,the two are pretty evenly matched for kinetic energy, i like and prefer 45acp for reasons outside of this though, i like it for how much better it performs when suppressed, and the fact i can chop old, damaged 308 brass down for more 45acp ammo, i find it recoils a big smoother and isnt as snappy as other calibers.. and would love to make a double-stack commander size 1911 with an under barrel rail as a "duty pistol" or for open carry
however, i look at it this way, some of the lightest, most concealable concealed carry pieces are blowback 380s, you know, compact little things like the bersa thunder, walther PPK, and all those eastern european copies (CZ82 being my favorite blowback)... compare these to the bersa thunder UC pro in 45acp and the UC pro 45 ACP is the same length, the same height, only about 1/8" wider, and about the same ammunition capacity.. so the UC pro 45 is a major upgrade to the 380s without really adding any extra bulk, weight, or losing capacity
so when i compare it that way and not to full size, double stack 9mms (even the really compact 9mms seem to be single stack and only 10 rounds), theres not that much of a dropoff.. so i think thats the pistol im going to go with, i dont feel i need to really compare the two side by side, the bersa thunder 45 UC pro is much better suited for CC than the cougar, so thats the one im going to go with
so.. verdict, my concealed carry pistol will be the bersa thunder 45 UC pro