I'm a little surprised to be the first to say this, but a J-frame is not the easiest gun to shoot--at least for me. I mean, it's small for a reason, and the reason is to make it easy to carry and hide. I do carry a j-frame, for that very reason; but I don't use it to shoot bullseye or IPSC, because it suffers disadvantages vis-a-vis other revolvers in terms of sight radius, capacity, power, and recoil control. The same disadvantages apply to a HD gun, don't they? Since an HD gun needn't be hidden in a coat pocket, I want to choose the one that's easiest to shoot and offers the best balance of power and control--for me, right now, a .45 acp 625.
Now, if you had to choose just one gun to serve for both HD and Concealed Carry, that's a different story. In that case, I'd probably still carry a J, and would use it for HD without too much concern.