One thing about 5-star is the make speedloaders that no one else does, that fit a whole mess of different revolvers, including .500 S&W guns and 8-shot .357 magnums.
But I'm a Safariland Comp II man, I just find they work faster and more reliably than either 5-star or HKS. I use my revolvers for defense, so this is most important to me, but 5-Star makes quality and they'll have almost anything you can dream of.