Wadcutters are great fun to shoot, accurate, mild recoil, what's not to like? And in the small light-weight revolvers that are so popular these days, they really shine.
As far as carring for SD purposes, I'm not so sure they are a good choice. The mild recoil and accuracy also means relatively low energy imparted to the target......not that I'd want to be shot with one, any more than with a .22LR. In addition, a lot has been written over the advisability of using any handloaded ammunition for SD purposes. It is controversial to be sure, and opinions are all over the spectrum, but in my mind that makes it even less advisable. I suggest carrying good, factory loaded ammo for SD purposes.