fire wire is braid, and personally I hate the stuff, too stiff, hard to get a good line lay on the reel till its been well soaked, and impossible to anything with it other than just drop it over the side of the boat
I use dyneema braid which is soft and supple and strong as owt, got 80lb on one reel, which when snagged won\'t break! just anchors the boat!, usually 60lb does me