I use 8-12lb mono on my baitcasters. No particular preferance...Mean Grean, Suffix Siege, Trilene, Maxima, I cant tell the difference. I usually spool up my spin rods with 6# Yellow Suffix Braid (which is way stronger than 6lb) and I tie on a 6' 8-12lb flouro leader. I switch out to 8# mono when its below freezing. When fly fishing for smallmouth, I usually go with 10lb mono tippets for poppers, 8# flouro for subsurface.