Several of us have mentioned PVC type materials. Uber-durable for sure. But one thing to keep in mind is that these materials expand and contract more than wood and that needs to be taken into consideration. Different brands exhibit different behavior, too. A general contractor friend of mine originally used Azek, but move on to a different product after expansion/contraction issues, including on my old home, caused some call-backs. He's had less issue with the product he uses now, but I do not recall what it is.
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The most expensive tool is the one you buy "cheaply" and often...