To be fair to myself, I had posted the Luckygunner test that include 38 special in 2" barrels.
The 150gr 9mm I mentioned is called "Micro HST." Though Luckgunner tested 9mm with a 3.5 barrel, their 40 and 10mm is full size. Add in the second link about barrel lengths in revolvers not having much at all difference in velocity (contrary to opinion), I don't think there is an information supporting wad cutter or FMJ in defense in j-frame.
A wad cutter won't go deeper than a hollow point and will not expand.
Even Luckygunner that I rely on for my two points, can't help themselves but recommend them without any actual data behind them. Metplat isn't going to be the cutting factor people pretend it is and a piece of paper target surely isn't data.
https://www.luckygunner.com/lounge/wadcutter-ammo-self-defense/
Dollar for dollar, expansion and penetration is the thing in 380, 9mm, 40, 30SC, and 45 but then a non expanding non copper washed/plated aren't.
Look no further than .380 Federal Hydro Shock DEEP. From an LCP barrel, the expansion and penetration bests a good chunk of the 9mm offerings.
Each there own. But I don't think there really is much data supporting anything but an excellent new or old Golden Saber bullet in +P in 38. If wad cutter is really the best option, and I agree bullets all are going to hurt, I think that speaks a great deal about JHP being important and j-frames being important.