I rented a G23 and liked it. However, I was looking for concealment so I ended up with the G27. With the mag extender it's as tall as the G23, if that's what you like get the G23. The 1/2 inch saved in barrel length with the G27 isn't as important as the 1/2 inch in height that aids concealability.
The pinky thing did bug me initially, but after reading Ayoob's technique and dry fire practicing a couple hundred times I got over it. I recently moved up to 180's in my G27 and the change in recoil was noticable. The 165 and 155 were snappy, the 180's really push! I'm going to stick with the 180's in the G27 as I plan on adding a G22 this spring and will run 180's in that as well.
The G27 is comfortable IWB, in a paddle holster or pocket holster in a jacket pocket. Accuracy is more than acceptable! I confess, I drank the Kool-aid...