Software trumps Hardware.
Meaning, the know how is more important that the tool used to do something often is.
I do not "tell" folks what they need as far as guns or ammo. Too many variables in human beings, in physical aspects (arthritis, amputee, recovering from surgery...etc) to legal jurisdictions (is a gun even approved in their jurisdiction?), to skill levels.
Truth is, the only person that really knows what fits them, is themselves, and they will not know unless they test for themselves. Other factors figure in, like if someone does not like a platform, finish, manual of arms, ammo too expensive to shoot something, they will not feel good about a choice.
I suggest. I base my suggestions on my life experiences and observations from MY doing, and assisting others.
http://www.corneredcat.com/ has some great articles on this, and, pictures showing gun fit, and so much more.
One has to feel confident in what they choose, and I do suggest getting some training, either from a seasoned shooter that knows how to diagnose gun fit and shooting, or a taking a class from a known trainer. Under stress, things change.
General Rule, a J frame revolver / smaller Semi-Auto is not for a new person to learn on. Medium frame guns are. Correct basic fundamentals need to be learned correctly and practiced.
As time passes, one may have to review and change selections. If a person once could CCW a .357, with .357 loads, or a .40 cal, and arthritis, injury , surgery happens, Go to what they can comfortably, safely, get quick accurate hits with.
One retired LEO used to CCW 1911 and Model 19s. Life happens, he went to Beretta .380 tip up. Nice gun, accurate, less felt recoil , easy for him to conceal.
One lady went to a Model 10 snub nose, life happens, she cannot use her Glock 26. Not to where she feels safe, and comfortable doing so. J frame conceals better, she can shoot one, but she is way better off with the Medium frame Model 10. Weak side from above elbow to hand, in a solid cast. She only has the fingers sticking out, to see how bad her nails are, and no strength in them yet. She has perfected the art of knocking everthing off a table with one swipe ( bless her heart).
Read Kathy's site, pay attention to the pictures on fit. You tell me a ___ in ___ caliber works for you, I am fine with your choice, if you took steps to actually find out for you, and not just because everyone else "say's" or is "doing it".
It is your gunfight - not mine. Awerbuck