As for concealed carry, a similar standard should be applied. Carry one that you can wear comfortably and one which you can shoot accurately. In some cases, the holster is as or more important than the gun for concealed carry. After all, if you are not comfortable when you carry, you won't carry.
Don't let anyone tell you that you need to buy "X" gun or something in "X" caliber (no pun intended for you King Arthur fans) because they believe it is the greatest thing since sliced bread. Go to a gun show or gun store and find one that feels comfortable to you. Next try renting that model from a range to see how well you shoot it. You may find that what you thought you wanted might not be the gun for you and something you never thought to try out before ends up being perfect.