What will last longer in Alaska? Stainless or Aluminum?

Just as the title say. My buddy wants me to put an exhaust on his f350 and we are trying to decide between stainless still or aluminum at about 130 price diff. They used a ton of sand on base fromm time to time to keep roads looking clear and used sand and gravel around town, but in an average place that snows about 8 months out of the year wich will hold up the longest?
 
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