Generally, in the last few years, my daily carry has been the Glock 26, which I think of as the service sized Glock in a small package. For me, it shoots pretty nearly like a 19 or 17, and holds 11 rounds with the flush mag. Conceals great under an untucked Polo Shirt, too.

Only on very rare occasions will I switch to either the Glock 42 in the same IWB holster (which, because of design and material, fits both perfectly) or a Sig P238 in a front pants pocket holster, and that's when even greater concealability (i.e., zero, or near zero, printing potential) is desired.