"Better" is to simple a concept.
More case volume means less pressure in a given load, that's the main reason to load long when using heavy bullets and fast powders as so many of us like to although if overpressure is not a concern with your particular combination of powder and bullet, I don't see any problem with loading shorter than SAAMI specs.
As for accuracy: I don't know... I'm not yet to the stage of my load development where I'm tuning OAL for accuracy, but I have heard some people swear by the accuracy of shorter loads.
I started reloading primarily to shoot 9 major, so my first priority has always been to make major and not blow up the gun, then to cycle reliability, then to produce as much gas as possible to work the comp, then accuracy. I haven't made it that far yet