I think you should carry one gun only. You need to be totally familiar with it. I own 3 guns that I consider are good for concealed carry or an off duty if I was still a Cop. They are the Colt Detective Special (I don't want to ruin the bluing and it has sentimental value since it was my off duty weapon, when I was a Cop.) a CS45 and a CS9.
I choose to carry the cs9, it has 8 rounds, is lighter and easier to conceal than the cs45. The cs9 is DAO, the cs45 is TDA. If it hit the fan, I wouldn't want to forget to deactivate the safety. I prefer the CS9, because it's trigger action is more like a revolver, like I am used to.
Carry one and train yourself on it. Learn to grip it so that you point and shoot so that it is 2nd nature. You will never ever use sights if it hits the fan. This is why I do not understand why you would want an off duty or a cc weapon with a lazer. The most I would understand is night sights, even then, I think it would be useless.
You can always dress to conceal your choice.