This last summer was my first time using poles. Given the price of lumber, I opted to cut down some small birch trees. I trimmed the side branches from the tree trunks, but I left nubs of the side branches behind to act as the 'screws' that
@Bluejay77 uses on his poles. (I was following his methodology, minus the lumber) I'd always used tall metal panels before that, a couple 8X8 frames. I was curious what the difference might be since I planted a lot of beans on both supports. One thing that seemed different is that on the metal trellis the plants are less lush. I don't know why, maybe that increased harsh sun exposure. But the poles were much more space efficient. The trellis was 6 inch spacing, with the poles I could get more in for the square footage. More beans in less space, and I don't have many of those big metal frames. Maturity is a wee bit quicker on the metal I think though.
One thing is for sure, rodents like the cover of the poles even when spaced far apart, because the growth is so lush it still gives them cover. The mice never bothered anything, but the voles were
And how gorgeous those poles look covered in a tangle of bean vines can't be beat!