I have to reconsider this question... hmmm...
Y'see, I'd like to say that my primary carry piece is my SCCY (SKYY) CPX-1, 9mm. It works very well, and it's the right caliber. But, some time ago, I acquired a newer, smaller CCW, a Kel-Tec P-32, and this thing was so light and small that I just didn't have any reason NOT to carry because I could just pick it up and go.
So, now here I am... a few months have passed by and I've come to realize that the P-32 is really become my primary carry weapon, and I don't even know how it happened. I mean, I take it everywhere no matter what I'm wearing -- it's just to easy to slip it in your pocket and go. And, all too often, the SCCY 9mm just sits at home. When I started to realize this, I started to keep track of how many times I carried with which gun and found... that I tend to carry the SCCY 9mm when I know I'm going out (like on Saturday or Sunday to the mall or whatever), and I just grab my P-32 whenever I need to take a "quick trip" to the store throughout the week. Anyway, those "quick trips" far outweigh the planned excursions.
I like that little gun... compact, thin, light, etc. The only thing is that it's caliber, a .32 Auto, is not really desirable. I've been thinking about trading it in for the .380 version of the gun.