I personally would carry the revolver. This is just my personal preference, I can't back it up with any kind of an argument. I like revolvers, but my carry gun is a 1911. If I was going for something smaller, it would be a revolver. I agree that the auto is probably a little thinner, but I don't think it is going to make a big difference as far as concealment goes. At least for me. If I am carrying, I dress in such a way as to conceal a gun rather than try to put the emphasis on the clothes and making the gun conform to my attire. I have carried a J-Frame in my back pocket, but trying to draw quickly was beyond me. I never had any luck with the pocket holsters either; they always come out with the gun. I have carried a J-Frame on a regular belt holster with a long shirt and it didn't look obvious in the mirror.