I have a few S&W revolvers. Matter of fact thats the only DA/SA revolvers I do have. Anyone who told you you can shoot as good in DA as in SA told you a fib. DA is mainly for rapid fire not hitting a target.
You can practice all you want listening to the little clicks that tell you you are almost there but you can throw all that out the window when your hearts beating 200 beats per min. and a 200 pound goober is coming at you full speed swinging a bat at you.
If I had a S&W revolver in my hands and goober was coming at me with a bat, do you seriously think I would take the time to manually cock the hammer each time for a well placed shot?????
When our club built some regulation bowling pin tables and we started holding matches, the most favorite handgun we all used were our .22 autos. All we had to do was knock them over and so we could go real fast. Many of the shooters over the next year or two got to where they could clear the table of 5 pins from the low ready in under 3 seconds and some of us were approaching 2.5 seconds. We talk about using a .22lr for defense. Back then I could put 5 rounds into a quarter shooting just as fast as I could at maybe 7 yards or so. An impressive trick and I'd hate to think of how much damage that could do to an organ or brain, but I don't carry my MKII for defensive purposes.
But put a revolver in our hands and the times slowed down appreciably. That is when I made it a point to never, ever, manually cock the hammer, but to always begin and end using dao. At first you want to go sa on the first shot, but you soon realize that messes with your rhythm. Eventually, you learn to trust yourself and can clear the table in under 3 seconds dao. It's a real hoot and those smooth S&W triggers make it easier. I've seen a Ruger 100 that was worked over that was also very smooth in dao.