Tatsu is the best I have ever used--and there isn't a close second. I buy it in 8, 10, 12, 15 and 20 lb test. For lift-and-drop bottom-bouncing baits, there is nothing better. It is outrageously expensive though and will encourage you to go braid to leader. Learn the FG knot and don't look back.
I have recently tried a few spools of Diawa Samurai, and I am impressed with it as well. It is cheaper, but it still has the feel of high-end fluoro.
For moving baits, there are lots of good cheaper choices. I bought several spool of P Line Tactical fluoro on sale last year, and it has been fine.
If you want to buy just a good in-betweener that can do it all pretty well, SunLine Sniper is good stuff.
For crankbaits and topwaters, I still like copolymer and McCoy's Mean Green has never done me wrong. Good combination of stretch, abrasion resistance and knot strength. Also cheap.
Now braid is a different discussion....
Gearing up for my third tournament weekend in a row right now. Looking at my line supply, and it is a bit embarrassing. Probably 30 spools in my line case--not counting the ones I carry in the boat in case I blow up a reel.