So sorry for your trouble that is having you look for another unit.
We have had both Al. and Fg. walled units, 9 - 12 years each, now 14 years with no intent to change. no preference except FG walled units can be repaired for minor damage. Paint fading and graphics cracking is a common issue after a few years.
2 1/2 " hail did not damage either walls, did knock out roof vents and such.
Do not focus on the exterior so much, rubber roof Fg or Al walls will do you well, with about the same amount of maintenance and ageing issues. its the other quality build that is critical to a unit that gives value and sale interest
Better quality units cost more.