I'll say that I love having the capacity in my versa-max, I load seven 3" shells in the tube and one in the gun. The newer gas guns are fast enough and have light enough recoil that you can get 3 shots off just like you would in an AR, shoots as fast as you can pull the trigger. The most shells i've shot on one stand was 5 and it was like the blink of an eye.
That 3 shell law for predators sucks, i'm suprised we dont have that law here in mass becuase we have every other law. However, in most cases you should be fine with three shells.