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Of the ones you listed, I would pick the P938.

I'm partial to the operation of that pistol (basically a Colt Mustang), and with the extra bump of being 9mm, and thus easy to find good ammo for it, what's not to like?

Not to cloud the issue, but don't forget that speedloaders are an option for a J-Frame as well, and with a little training, can be ALMOST as fast as a mag change on the smaller guns. Note I said "ALMOST," and I realize you're still talking about 5 shot reloads.

That said, a J-frame for pocket or backup carry is never out of place in my mind.