I've always been a beliver in the theory that if you define your needs (or your question) well enough, it will point to the answer. What do you want this gun to do and for whom? "Current, older" is the IL an issue for you? Can you check out a used revolver? Do you like to buy new?... "airweight" How big/healthy is the person that will be carrying it? How often/long will you carry it? What is the ratio of shooting to carrying going to be? If you look at what options that are available to you and see what the strong points are for each option you should be able to pick the right gun for you. I counted 208 different revolvers in my latest SW catalog.
Trigger, I'm not ragging on you, just looking for more info to base a recommendation on. As I look back on your OP, I see that it is asking which one I would buy. I wouldn't. I have a 637, and don't want a Bodyguard. Are you familar with the "Ben Franklin Close"?
Lop