All I can say is when I fish wood like Bordella, Oak, or some type of hard wood be it natural or pallets. It seems to always out fish PVC pipe structures. I hardly ever do as good around sunken ceder or xmas trees either. Some say the sap is toxic to the fish others say the limbs are packed to close together for fish to make use of them. So for me i like hard wood cover first and foremost, PVC/metal second and ceder or pines last. Just my pecking ordor. Where legal for me just drag a big ole limb from a dead oak tree or Iron wood tree out and sink at a location of your choice. Lots of dead trees around the lakes we fish.