I have a house on the coast and drive on the beach regularly for 2 years now, only rust Ive seen on my cheap steelies is where I scratched them up while offroading. Shouldnt have a problem with either if you have some steelies that you have your eyes on. Aluminum will pit, but wont rust. Also are lighter but more expensive.
07 JK 2D X model with 6 speeds. Full Traction 3" ultimate lift kit. 315x75x16 Toyo Open Country M/T on Rock crawler procomp rim. Ruby dana44's front sleeved inside/outside C truss and rear with 5.13's gears. Homemade rock guards, rear bumper w/tire carrier, oilpan/tranny skid, evap canister skid, light bar, switch pod. Riddler diff covers, Cobra 75 w/wilson antenna, Polk speakers, 10" sub, 2x Amps, Lightforce 240 drive light, backup lights, rock lights.