For browns I use 12lb Trilene Big Game Mono (Clear) on the Rigger rods (Ugly Stik 8'3" L), with a 10lb Seaguar Fluoro Leader. On Planer Rods used on big boards flat-lined, I use my walleye set-ups with 10lb Trilene Big Game Mono (Clear), with a 10lb Seaguar Fluoro Leader (Ugly Stik 8'3" L). My 3,4,5,6 color Leadcores I neck down to a 12lb Seaguar Fluoro Leader - also ran on the big boards (Okuma Classic Pro GLT 7'6" ML).
Trilene Big Game Mono is cheap, effective, and has worked for me on all Walleye/Brown set-ups. I also use 20lb Big Game as backer on all of my leadcores (hi-vis Green).
Good luck and have fun spooling!