Looks like the Single Six is the winner by a good margin.
I agree, I have two of them.
But I haven't seen one of my favorites mentioned - NAA MiniMaster
4" barrel, 5 rounds, .22 magnum, single action, all stainless, and smaller than a Bearcat by a good bit.
Disappears in a pocket, front or back. Holster comes with it, but I rarely use it.
The fixed sights work fine. Quite accurate.
Shotshells even pattern pretty well.
.22LR cylinder also, for cheaper plinking or CB caps.
For a real woods walk, or just piddling around the house, it's usually my choice.