Well, I'm sorry Guys, but my true favorite Model 19 is my 19-5, with 4" barrel & Round Butt, which I absolutely love. BUT, and we know that there's always a 'but', is that if & when I carry a somewhat heavy Revolver, I usually prefer my M-64 4" HB Round Butt. That's what we initially ran in that Academy back when I started. To me, that 4" H.B. with +P+ .38's shoots like a true friend, all 6 in a nice tight center mass grouping. Lately, unless you count my 642, pretty much all my carry weapons are autos. BUT, that M64 just points dead on for me, even with my eyes closed.
Best, dpast32