The benelli is a good gun. Start shooting you'll quickly get your answer to whether you need another. I recommend you spend your extra $$ on ammo (and training, both are lots of fun.)
(For a second shotgun I did have to buy a side by side myself)
Is OP referencing the fact that both Benelli and Beretta are under the same roof (of sorts)? And possibly comparing quality or one or lack thereof? I would be happy with either one. Without knowing POU it’s hard to say.
Over/under shotguns are technically semi-automatic. For a gun that you are aiming (i.e. a tactical shotgun), feel or "pointing" is irrelevant, but for a bird gun, you should never be "aiming" in the traditional sense. Thus, for a tactical gun, the poorer weight distribution is more than offset by the extra ammo capacity. For a bird gun, where if you use more than 3 shells you're poaching, a 33% loss in magazine capacity can be more than offset by better pointing. My approach with new guns is to try and establish a role that I want to fill and then go down my list of firearms to see if something fills it. The role can be as broad or as narrow as you like, but I try to avoid completely overlapping. In the case of semi-automatic shotguns, a good over/under might give you more options than another autoloader. I would shoot one first, see if you like it, and then make a decision.