I'm a new shooter and i've shot the M&p9c and 92fs, and I shot better on the 92fs but i credit that mainly to the less felt recoil on the Beretta (due to weight) and the fact that it was fullsize. Slide was noticeably easier to rack on the 92fs as well. Also the M&p9c was a Mass. version w/ the 10lb trigger, so i guess that didn't help my accuracy.

I own the M&p9c and thinking of a Beretta in the future as well. I've always wanted all metal gun and the Beretta is at the top of the list (and the 1911 as well).