When in the market for a 20 gauge clays gun I went back and forth between the Benelli Super Sport and the Beretta 391 Sporting. The Beretta was chosen but it was very close. What tipped the balance was probably because I already had one in 12 gauge and was familiar with the system.
The Benelli fit me well, was very light and handled nicely. What I didn't like when compared to the Beretta was the heavy trigger pull, the glow stick front sight and the barrel porting. My semis do double duty as hunting guns and I typically don't wear ear protection in the field so porting is not for me.
But the Benelli is a fine shotgun and I continue to be tempted by them.