The 5 vs 6shot is the smallest factor. Even with the proverbial "carried lot / shot little" is not the same thing as "carried lot/ shooting (hitting) doesn't matter" .

I used to carry an AirWt .37 religously ... As a BUG . To me a J frame is a specialized gun , specifically for ankle and pants pocket. Carried in a decent belt holster the wt of a K frame is negligable. So much so I will often enough carry two on my belt. If not two K fr's , a K and somthing else of *real* size .

And a K fr with either a grip adapter or Boot Grips is just as concealable under a shirt as a J frame with oversize grips.

I remain in my infatuation with 2in RBs ( M10, M64 ) because I like the feel and balance , but a 2.5 or 3in would belt carry similarily.