.357
I feel comfortable carrying a M-36 2" (.38 Spl. with 125 Gr.+P ammo) around the southern area of New England. Out in the "wilds" of the Berkshires, I move up to a M-66 2.5" with 158 gr. JSP ( Med Vel .357 mag.). If I had a M-629 2.5" .44 Mag., like the one pictured (nice one C&L), I would carry it (for sure!!!), instead of the M-66. I prefer lighter, smaller, snubby revolvers. For me, they shoot as good, if not better, at the closer ranges, required in self defense situations. From what I've heard.....you don't notice the recoil, or hear the blast, in an emergency situation. I have never been in that situation.
To answer your question.....bigger is better! There's no such thing as overkill!!! Bob