OK, so we have built a lot of houses, and I always told people, unless you like painting or paying for paint do not put stuff you have to pain or stain on your house, vinyl, hardie board, ect will be good for a very long time vs clap board and wood siding is going to need finish frequently... BUT in some cases like trax you pay a lot for it up front...
When I built my own house I used fiber cement board siding, stucco, and stone, and then all 4 porches are done with composite decking, aluminum trim, pvc railings and ceilings... I wouldn't think twice to do it again, it still looks good, east to clean, can be slippery and get hot in the sun {our porches are all covered with roofs} but if you install it correctly it will last a very long time and look very good the entire time, plus no splitting, splinters, rotting, softening, bugs, ect....
If your boards are still good and just need stain and you used deck screws and not nails when you installed them you can easily sell that wood, expect to get 1/2 price but someone will buy it, when I rehab rental properties I trex deck any outdoor flooring they have and if the existing wood is good {sometimes its almost new} I advertise it on craigslist and it doesnt take long to sell it, in more than one case the guys came and wanted to measure my deck so they new exactly what size to build their own, I had a guy buy a 20x18 deck from me and then measure every board and drew picutres of how it was built because he had no idea how to do it, he even asked me how long the anchor bolts were, not sure if his deck is still standing but he had to save a bunch of money buying used flooring, rails, and doing it himself...