Many captains and rec boats use Amish Outfitters 500 lb. spectra. Indestructible and relatively smooth. I would never go back to Dacron. Use a snubber with the spectra, also sold by Amish Outfitters, UV resistant nearly indestructible.
Some old school Erie walleye guys used huge lengths of weed wacker line. Stretchy and smooth. From what I hear it blows up plastic planer reels. Metal is the way to go anyway, see Cisco Fishing Products line up. Yes spendy but you will destroy other brands with time.
I use cheap Home Depot mini carabiners attached to all my planer releases. Adds weight, less drag and easier to use. I highly recommend the purchase. They zip down the line.