I'm about to purchase a S&W primarily for USPSA shooting events and have some handgun training from years ago (ex-military). I have settled on either the M&P 9 model 109301 (10+1 magazine) or the M&P 9 model 209301 (17+1 magazine). Given I will mainly use the gun for competition shooting in the Production class, which limits magazine capacity to 10 rounds, what are your thoughts on the 209301 and is there any other reason I'd need to 17+1 over the 10+1? Price of both is the same though unsure of the cost of spare magazines and other accessories.