Perfect in our opinion for a few reasons:

the 9 is shorter than the .38/.357-shorter, I think, means that the round develops all or nearly all of its energy inside rather than producing a spectacular flame ball with the .38 and a truly spectacular flame ball with the .357

we can buy about 1.5 9mm for the cost of a .38 and two 9mm for the cost of a .357-even more if I get the Buffalo Bore stuff.

9mm is still the most popular caliber on the planet-availability has been and should remain much better than all others.

I certainly could be in error with regard to caliber though what we see with .38/.357 that is not present with the 9mm makes me believe we are correct.

What I am certain of is that all 'we' need is a revolver, any caliber up to and including the fine 9- to be as protected as any civilian can be.