stainless steel vs aluminized steel, mandrel bent vs regular bent

Had 3in aluminized standard bent exhaust for about 10 years on my big block 4x4 daily driver.Went through many rainy days still looked decent but the blowmasters mufflers and clamps were starting to rust out.The guy that bought it is still going strong with it, standard bent really crimped the pipes and looks ugly at the bends but it was a daily driver so I didn't care.