When I was in high school I bought a S&W combat masterpiece. I shot thousands of rounds through it, but could never hit moving targets with it. Neither running rabbits or thrown bottles. Then I acquired a SA. All of a sudden I was able to make hits on moving targets, not 100% of course, but they were possible. I believe that it is just the difference in point ability. For me the SA points naturally a DA does not.
You may like the looks and feel of the 4 3/4 barrel, but you should try a 6"er before you decide too firmly. I have both, and the 6" is the most accurate handgun, not counting single shots, that I have ever shot.