I am looking to buy a SIG P239 in 9MM. I can get a poly version 17.7 oz. Or an alloy version 25.2 oz. Both NIB the price difference between them is 0ne dollar. My question is that i will use this pistol for carry, witch one of the two versions would be more accurate, and reliable? For carry i would rather have the lighter pistol, but if the alloy is more accurate and reliable i will deal with the extra 8 oz. Advise me on what to buy please.