Depends,water clarity is a big factor,areas of extreme fishing pressure one needs to think "line senitveity" fish,most walleye lakes we fish have Gin clear water so 4-6lb leader line in "ultra thin works for us when riggin crawlers or leeches,if your target fish are suspended off the bottom a few feet fluro wouln't be the "goto leader line as fluro is hollow and sinks great for bottom huggin walleyes,stained water one can beef up leader line such as 8 to 10lb test and use a beefy #4 or #2 salmon egg hook in brand of your choice,lots to pick from out there on store shelves,just a couple thoughts.