Both 9mm & .380 go BOOM. Both kill Bad Guys DRT if you do your part.
If you are a small/medium-build person, male or female, 9mm or .380 will do you justice.
In the grand scheme of things, precision, practice, and Big Honking Bullets are my favorite path.
Especially since I'm basically a shaved gorilla and can carry & handle large weapons.
So I'm into making certain that if I ever have to shoot anyone as a civlian, if they are not DRT, they will not recover anytime soon, therefore I use a Glock 20 (10mm).
Big impact + big holes, equals pacified bad guy.
However, the average guy/gal can't hide a full-size Glock easily, so the Glock 27 (10mm),
the compact version, is a good choice for the experienced shooter.
My wifey, being a much-smaller-than-me individual, uses a Taurus 24/7 Pro C (compact 9mm).
It's the same size as the Millinium series, but has a pic rail for accessories!
They have changed the model designation, so it's now something else.
Biggest problem with Taurus 9mm's, the mag lips usually need to be adjusted...takes a few minutes, but it's worth it