Wrought Iron
Iron furniture is extremely durable structurally and holds up well against Arizona wind, but its main vulnerability is rust once the protective coating is chipped and monsoon moisture gets in. Regular cleaning and prompt touch-up of chips is the key maintenance need.
Aluminum
Aluminum won't rust the way iron does, making it lower-maintenance in that specific regard, but it can pit or corrode with a white powdery oxidation if left uncleaned for long periods, and cheaper aluminum frames can fade or chalk under sustained UV exposure.
Wicker and Resin Wicker
Natural wicker breaks down relatively quickly under Arizona's UV intensity, becoming brittle within a few seasons. Synthetic resin wicker holds up much better against sun exposure but still needs regular dust removal from its woven texture, which traps grit more than smooth metal surfaces.