I use 2# test Fireline Crystal for my main line with a 4' fluorocarbon leader. I've taken some really large fish with this set up. The line never breaks and the white color is easier for these old eyes to see. The reason for the leader is for abrasion resistance and some stretch (shock absorption) that fluorocarbon provides. I would use no other knot than the Alberto for connecting the fluorocarbon to the main line braid. It has proven itself over many season of continuous use. Very dependable connection.