BEWARE of lab tests vs actual shooting results. I saw 8 dudes shot in various places, all with ball ammo .380 ammo, at Medstar in DC in the same night. (They were all shot at different locations of the city btw). 3 were shot in the legs and the round went through, the other five were all shot in the Arse and only one of the ball rounds reached the hip bone. All were shot at under 10 yards, in drug confrontations. Several were at point blank range. Sorry folks, but the average .380 ball again MAY pass through a human torso. Don't bet your life on the gelatin results. The .32 Walther was really used by Germans so their uniforms would look good while having a gun in the pocket. It wasn't so good so they made the 9mm Kurz (short) aka .380.
Dave, I used to be in the field, sending the odd victim to Medstar (PGFD), and I honestly found that, in 35 years of experience, that the only thing that you could count on with a handgun, was that you couldn't count on it. I also have to observe that most people who are shot in the butt aren't shot at point-blank range, they're moving away as fast as they humanly can.
As far as the reason that Germany, Italy, and the rest of Europe used the .32 ACP had NOTHING to do with looks. The guns were also worn in holsters, on the hip. In fact, the Germans issued FAR more Walthers in .32 or .380 to police, and security, than they ever put in the field. The military used the P38 where pistols were issued as much as possible.
As to energy figures, most manufacturers use a 4" barrel. The 2" of some snubbies costs a good bit of velocity.
Speer makes a 38 Special +P that is designed for barrels of less than 4". Load number 23921 is a 135 gr. bullet, moving at 860 fps, for 222 ft/lbs.
Buffalo Bullet makes the 27A loading in .380 ACP +P. Out of the 2.74" barrel of the Kel-Tec P3AT, specifically, it produces, with a 100 gr. bullet, 1061 fps., with an energy level of 249.7 ft/lbs. These are factory numbers, published and available to anyone.
I think that you'll find that MOST .38 Special ammo, in 2" barrels, or 2 1/2", is pretty much right along those lines. As with anything else, semi-auto cartridges were always loaded pretty lightly prior to the 1980's. Many still are. That doesn't mean, however, that they have to be.
The .380 platform is available in smaller packages, that still allows for control, than the revolver. They tend to be a bit cheaper, in many cases. They re-load faster, and hold more ammunition per loading. They are a great choice.
If, however, you are interested in esoteric bullet shapes, or just like the revolver, you aren't going to be unarmed with one.
It's pretty much a choice of your own, with the confidence of that choice much more important than the choice itself.