Of course proper fit is first and foremost, thrown in for good measure is your budget. I've had a Benelli M2 26", excellent gun, Beretta 391 26", again great gun and now have a Beretta Xplor 28" with KO and it has been excellent. The only reason I sold the M2 was i just didn't use it enough, so away it went. The Beretta 391 was sold because it just didn't swing well for me and something else caught my eye so away it went. Then a while later and after a shoulder/arm injury, I decided that I needed another 20 gauge semi, so a bought the A400 Xplor with KO and its a pleasure to shoot. I've never owned a SX3, but know a few folks that do and they have nothing but good things to say about them.