I own both. The aluminum is harder to heat and cool, less sound deadening from outside noise, harder to seal the windows and doors from water intrusion because of the corrugated metal, lighter and easier to tow, cheaper to purchase and more prone to hail damage and dents. Easier to repair damage.
If you take care of it and keep it sealed properly you can get 20 years out of it. Water intrusion and ultra violet sun do the most damage. Storing under a carport will contribute to longevity and keep it looking nice .
