stop teasing the MA guys by hanging the S15 magazines for the G48/43X in front of them.
If I were feeding a 48 or 43X a steady diet from S15 magazines I would probably change the mag release to the Shield Arms steel replacement... in some circles there is concern that the steel Shield Arm mags don't play well with the OEM polymer mag release, but the $25 dollars is short money to get 15 round capacity and not having to worry about having the mag drop out unexpectedly...
I was not sold on the 48 or 43X at first because of the inability to interchange magazines from the 17/19 platform, but now that they have gone all black and added a rail, and in free states you can use the Shield 15 round mags, I have warmed up to them.
Many people consider the 48 with the slightly longer slide easier to carry IWB and find the balance better with the extra couple of ounces on the far end. There is also something to be said for the longer sight radius.
For CCW the 48 gives the 19 a run for the money, and I have always liked the 43X over the 26 because of the differences in the grip.
YMMV