Deck Wiring with UF cable
I am building an outdoor deck and plan to install lighting and outlets. I have been told I can use UF cable as long as the wiring is "properly supported" and not "subject to damage". I am contemplating running the UF under the deck from point to point and attaching it to joists with wire staples. I would run it through hollow deck posts to reach lighting fixtures and receptacles, and use short pieces of Sched 80 PVC conduit as needed where it may come through floors.
My neighbor suggested I should use conduit everywhere and THNN/THWN wire instead. Is this required or just preferred? It seems like that would be a great deal more work, but I am willing to do it if the advantages are considerable. Can anyone weigh in with pros/cons?