stainless steel vs aluminized steel, mandrel bent vs regular bent

Our roadrunner... TTI 3 inch mandrel bent system with X-pipe. Why? FLOW... if we were going to buy an exhaust, we wanted a good one that was gunna let the engine breath as much as possible. It's aluminized and after 3-4 years it still looks great. I think aluminized is fine unless it's something you'll be driving every day in a place like PA, with a lot of rain, winters, etc.