I use as many lines as I use fishing poles. It really depends on what type of fishing I'm doing when I choose what line to use. I use braid/Fireline/Nanofil when fishing deep. Just about any mono will do when fishing the spawn. I fish on creek that will leave you fishless if you use any line over 4 lbs. Is flourocarbon on this creek because both crappie and whitebass will swim right by your bait if have any line over 4 lbs. It's not a clear water creek but for some reason those fish are extremely line shy. I took a old pro to show me how to catch fish in this creek. Most folks think it is a waste of time to fish it. This also applies to urban ponds that get alot of fishing pressure.