I recently put away the J-frame and went back to a micro-.380 (Kahr CW380) for my pocket BUG/ultra-small light pocket gun.
The main determinator for me was the availability of the Underwood/Lehigh Penetrator 90gr. ammo and how much easier the pistol is to shoot than the revolver.
Finally a flash suppressed, deep penetrating .380 with a bullet profile that is less likely to deflect off a hard surface than FMJ.
When comparing the Underwood Penetrators to the wadcutters I usually kept the J-frame loaded with the terminal effect differences don't seem to be much different.
Both will easily go 20"+.
As far as barrier/bone penetration the .38 does it with weight the .380 does it with bullet profile and solid copper design.
The wadcutter will come closer to cutting a full diameter hole but the .380 does have a somewhat semi-wadcutter nose on it.
While the .38 wadcutter is probably still the better ballistic performer the differences seem to be so slight that the additional 2 rounds and how much better I shoot the .380 have me pocketing it instead.
Thoughts on the new .380 bullet tech Doc?