In this day and age of ours, I simply cannot think of a single benefit there would be to carrying a revolver vs. a semi-auto.
I can think of two very good reasons. The two times, as a working street cop, that I had a real need for a weapon my M-19 worked just fine.
As I was grandfathered in, I declined to carry an bottom feeder when my department first issued them.
Now retired many years, I don't always go armed. When I do, it's with one of several S&W revolvers.