Fiberglass exterior, aluminum framing on all 4 sides and roof. We never looked at aluminum sided, since in our area they just didn't stock what we liked. Fiberglass is much easier to wash and IMO looks better. As far as delam, well I guess it can happen but I do my best to check caulking. As far as the weight thing, our TT is a rear living @30'10" long with a dry weight of 6189lbs and 7200lbs loaded. I have a friend that has a Springdale 266RL thats essentially the same layout and size and his TT weighs almost exactly what our TT weighs. I think the aluminum framing on our TT must help keep the weight down.
Fiberglass is more for esthetics than function. Aluminum will show every dent, nick and scratch. The advantage of aluminum is that it's lighter and can be repaired easier without having to replace an entire section or have the delaminating issues of fiberglass.
If I didn't care about the difference in looks, I'd go for the aluminum for durability and lighter weight.
I prefer aluminum myself. I like the looks of fiberglass and they stand up much better to hail damage. Aluminum is lighter, a little cheaper,and is cheaper to repair damage. In my area they develop a nasty yellow cast from the sun and I hear too many complaints of delamination.
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