I was kicking around the idea of a small truck pistol, and these both felt nice in the hand, the 39 feeling quite nice actually.
I was at a local police supply store this week, and wandered over to the used gun section. They had a real nice S&W 39 for $240, and a 915 for $260. Both of them were in nice shape, the 39 being in the nicest. The 39 also had a nice double action trigger whereas the 915s DA trigger was vicious. Both had mag disconnects.
Between the two, I’d definitely take the 915 for it’s capacity and much more modern design/manufacture. It should feed the better JHP’s no problem, and mags aren’t an issue either.