I have a lot of experince with two of the Three. My first choice would be the Browning. Too bad it's gone! The Gold Classic and Franchi 612 are very similar loooking and feeling. The Franchi is lighter and less expensive ($200-$300) than the Browning. I would describe the Franchi as being quicker and the Browning being smoother. They are both gas operated, hold 5 shells, and have magazine cut offs. Browning's is via a lever and the Franchi's is automatic. The Browning's are the only semi-auto shotguns that have the speed load feature. The Franchi gives up a little in quality and zero in realibality(so far) to the Browning. I have been very impressed thus far with the Franchi 612. The Franchi "612", Beretta "Pintal/ES100", Stoeger "2000", and Weatherby "SAS" are the best buys in semi-auto shotguns today. You get a lot for what you pay for them.
I would by the Winchester second if it were the Super X-2 but, it's not.