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This question will easily get you several different answers but don’t worry. My personal favorite has been the Stren Hi-Vis golden flourescent. very easy to see, control, and tough as nails.
I have been trying other lines as well such as Berkely XT in the dark grey color. Very good stuff too.
I also have the Fusion on a reel and like the sensativity of it but hate that it clumps on my spool. A cross cut section of it showed me it isn’t round but eliptical. I think that is causing it to bind up.
I will be trying the good ol spider wire soon to see how I like it. Who knows could be good.
But when it all boils down the spare spools I cary are Stren Hi-Vis and Berkely XT. Why? They work well for me
The only line weight I use is 6lb (excpet the super lines). Four pound is nice but always broke at the spool if I snagged up and that doesn’t take long to lose a spool of line that way. Eight just never gets down to the bottom like I like it. Good luck!