I though the same thing, I heard something about Beretta owning Benelli, and Benelli split from HK and started its own dist. facility. Only deal HK has with Benelli is to help its military contract with the new M4 shotgun.
I have shot both, and I own several Benlli, I love my Benelli and I think the Beretta is a cheaper version of the Benelli, and although its workmanship is not as pretty, it functions just as well as the Benelli. One thing about the Beretta, it is lighter, so the recoil is a bit heavier.
I don't think Beretta is better in reliability, i have shot all types of loads through my benelli, never had a problem. you can get a lighter recoil spring in your stock to adjust the recoil problem with the Benelli(my benelli don't have it), it will make your gun kick like a mule, but it will function with anything you can throw at it.