I know I personally ran maxima ultra green for many years as my leader mostly 6lb label. Several years back I jumped on a fluoro push, and have remained there. Looking to see what everyone prefers these days and why. I think some good info here would include brand you use, preferred pound test, and why you prefer fluoro over mono, or vice Versa. The knot you tie may also play a role. Maybe any weaknesses you feel your current leader has. So - I will start it out- Fluoro 6-8lb labeled Drennan or trilene 100% pro grade I have fished it for the supposed light refraction matching that of water closer than nylon, supposed increased abrasion resistance Knots- either egg loops or uni style snell on plain hook, trilene knot on jigs and swivels. Weaknesses - I can’t help but question if I have some varying knot strength not matter how careful I am and how much I wet it down. Ultra green was always a smoooooooth knot when tying. Looking forward to other’s thoughts! Can be fun!