Be sure to try out the Beretta before you buy/sell imo. Just looking at the specs of the two guns you're getting a larger, heavier pistol and sacrificing 2 rounds if you go with the Beretta.
I've shot and held a 92fs many times and do not really like them. If this is a case of you not liking the Glock the perhaps try a XDm or an M&P. I believe those are in a somewhat similar price range.