I've got a few of the smaller grip 45's here's my opinion on a couple.
Kahr P45 - I have to say of all of my polymer Kahrs of which I have five now and have owned two others; the P45 is the best and has been from day one. Never required the slide lock to chamber the first round, super accurate and fit's my hand better than all other polymer Kahrs, my K40 fits me well also. It's accurate as can be, I put an inner tube on for a grip, it's a great pistol and what I've been carrying IWB exclusively lately. It holds 6+1 but there is a ton of room left in the mag so I'm sure with some tinkering I'll get 7+1 with 100% reliability. Kahr mag springs are the best in the business.
Taurus PT145 Pro - 10+1, great gun also. Straight Eight sights suck, you can get a 24/7 rear sight and have good three dot sights. Mag springs suck, I replaced mine with OEM Glock 30 ten round mag springs, they work great. There are some bad mags and weak mag release springs out there but if you make Taurus CS promise to send you replacements they will.
Glock 36 - I bought this gun for the sole pupose of using upper on a Glock 29SF frame with Glock 30 mags. It's dead reliable, has nice mag options (9, 10 and 13 round) but recoil is harsh and it's fat as in SF: Still Fat! I always hated the Glock 36 because of the grip which is really a two finger with an extension on the mags. They suck for mag changes and with a 6+1 pistol, I always carry a reload. The P45 is the better single stack and has factory 7 round mags for reloads and range, unlike the Glock 36. There are +1 extensions available but you need extended, non-OEM springs.