I like the answers from DB68 and CajunBass. The very first question is "How do you dress?" The second is "What size is your hand?"
I suspect that the vast majority of posters here who carry daily carry J-frame revolvers. This is usually not the best revolver to carry, but it is a lot better to carry one of these than to leave a better revolver (or, perish the thought, bottomfeeder) at home. If your clothing permits it, CajunBass's recommendation is one of the best compromises. Myself, I usually carry a 2" Model 15, because I like the sight picture better and the weight and grips (Safariland/Rogers) help, too. When I find that burdensome and feel that I can afford to give up its advantages, I usually drop all the way down to a J-frame Airweight, because I can shoot those as accurately and quickly as my Model 12. However, the Model 12 is more comfortable to shoot, and carries one more round. I sometimes carry it.
You have to look at what you CAN conceal and carry, and find out what you can shoot well. Dressed right, you might even end up with a steel 4" revolver, frame size dependent on hand size and choice of grips.