I have the Beretta 686 Silver Pigeon in 20 gauge (26" barrel) and just love it. I've previously owned Citori's and like them as well, but there is just something about the fit and finish of the Beretta that gives it a slight edge in my book. I don't think you could go wrong with either, but in my research, it appears that the Silver Pigeon holds its value better than the Citori.
