Steve Morgan did a really good run down on leaders
here and fc rock tested poorly so I'd skip that.
Personally I'm using unitika anger III and have been for the last year or so and love it, low diameter for its breaking strain so can fish a little heavier around structure if needed. Have a couple of spools of the yamatoyo in some slightly heavier line classes and it gets the job done but I'll probably get shimano ocea or unitika aiger III to replace it once the spool is finished.