Really apples and oranges. The Python and 686 are closer in frame size than a 66 and Cobra…mid-frame and small frame respectively.

For pure performance little choose from. For concealability it’s the Cobra all the way but it’s strictly .38 Special where the others are .357 capable. But a .357 round is pretty much wasted in a snubby…too much blast and flash with little velocity gain.

When I was a LEO and at the time restricted to revolvers I owned a Colt Cobra and a Python snubby and a 66 snubby. I carried the Cobra off-duty far more often than anything else.