A lot of people love wood, but I feel like even with constant treatment and good quality material to start with, it still goes bad pretty fast.

Besides how well it holds up against weather, I'd also think about how much sense the material makes economically for what you're trying to do and the scale of your project. Metal is way easier to maintain, that's true. And on the topic of how it relates to project size, I'd check out this , it basically shows how the price and practicality of the material change depending on the size of the building.