Good question... 🤔🤔 personally I like how indicator lines have that pink tip as a reference. But other than that I just look at the taper, and the colour kinda just goes with it. But if I were to choose I would say the pale blue (like OPST heads have) are my first choice. But that's also because I like blue
The colours for lines I don't like are chartreuse and bright green. I also had a bright orange line for a long time, which eventually frayed. The bright colours seem to scare spooky fish even with long leaders. I bet you the airflo clear line would be a good solution to that.