For a 4" 357 Magnum, I certainly prefer the M-19 or the M-66. I like the shrouded ejector, and the adjustable sights are rugged enough for most activities while allowing elevation adjustments when going from 357 Magnums to a variety of 38 loads.

That said, for a shorter round butted 357 for concealed carry I am more fond of a 3" M-13 or M-65 over the 2.5" 19/66. I own both and find the low profile fixed sights and extra 1/2" of tube just make for a better package and they point GREAT.