i didnt compare to trex, but we did compared to a higher grade composite that they sell up here in Idaho. i forget the name, but it was thicker than trex. the alum came in at aprox 25% more in overall cost, but they had to add shipping to that. i had order shipped to a main terminal in Spokane as opposed to my house, and this cut the ship cost by over 50%. i picked it up from dock myself.
The thing that sold me on this was the fact that i wont ever have to mess with it again...ever. My old wood deck had to be constantly resanded, bleached and restained. The old steel handrails had been removed, sandblasted and repainted 2 times in past 20 years. ENOUGH ALREADY.
i went with powder coated aluminum to eliminate the hassles once and for all