I buy the small spools of "leader" material in mono. Much better value. Usually Stren original or Trilene XL in clear. I'm not great with knots so I use a back to back double grinner for line to line connections and fluorocarbon is too brittle for this knot. I can tie the other knots (surgeons and blood) and I test, non scientifically, different materials with different knots. So, it's mostly because of my knot MO that I use mono. I love fluorocarbons thin diameter, low stretch and low visibility. It's finicky with certain knots though.