I shoot a Beretta Ultralight 12 that tips the scale at 5.7 lbs. The guy I bought it from sold it because of the recoil - he was 6 foot 160 lbs soaking wet. I am 5' 10" 215 so much better padded than him. I love the gun - regularly shoot 50 rounds at clays with it with no problems (I'd be lying if I said that I'm mot sore by the 47th shot, but don't need aspirin and doesn't leave be bruised). I cerrtaily don't even notice the recoil during hunting. I have a limbsaver pad on it. I love the easy of carry and the speed of mount. Anyhow, my opinion, is, if you're not recoil-sensitive, then go with the light one, all else being equal. However, if the SPort fits you better, that's more important than a bit of weight, so I'd got with the Fit/Feel first, weight second.
-Croc