i prefer lead core over copper. the main reason is that you do have to let out more line to get down further. i know it is less work to run copper because it goes down quicker but i feel the reason lead has always outproduced copper on my boats is that it is WAY BACK. i think the farther away from the boat the better, 100' leads on the riggers or a 2 color, and divers set on 3 so i can get em way back.