i use flouro 20lb for leaders no certain brand because its supposed to be tougher extra cost not to bad if just using for leaders think mono is fine biggest thing is checking for damage on them now and then especially after a tangle . on my salmon gear i only use flouro line gets wrapped around your downrigger cables or wire dipsey rods sometimes landing fish think it just holds up better .when i run inline boards 12-17 lb mono direct to crank bait