My armchair assessment is that both will have their uses. 80/20 is 3-4x the price, but is lighter and more rigid than EMT conduit. EMT conduit is sold everywh

My armchair assessment is that both will have their uses. 80/20 is 3-4x the price, but is lighter and more rigid than EMT conduit. EMT conduit is sold everywhere and will be more useful for quick and dirty setups. For a machine like a 3d printer, I would choose 80/20. For some lightweight shelves, EMT conduit or wood. So I see this product almost as a wood replacement rather than a 80/20 replacement.