Both have their Pros & Cons. But I have developed a severe prejudice (hatred) for 10 color lead core, for a couple of reasons... Very hard to tell if you have a smaller fish on..... The overall length of dragging 10 colors around... It just wears me out after a couple of fish etc.. I know Copper has a few issues too.. special rod guides, birds nests etc... But why run huge lengths of lead-core when u can get the job done in 1/2 of the distance w/copper? Thanks for your input! Lope