In all my gunning life (owning for a hair over three decades) I've own a sum total of TWO J-frames and J-frames are not for me, I cannot imagine there even being a third example to appear in my collection.
K-frame S&W chambered in .38 Special however, I'm at or near a dozen.
I love shooting K-frames on any range day. I don't care to go about armed with a revolver. I understand that others do and I respect that. If I did care to carry a revolver, I would probably revisit the J-frame.
But for shooting .38 Special, man I dig a K-frame!