Zephrioth
Anyone who ever played FF5 would know that the best sword in existance is the excalipoor. The sword did 1 damage to anything. Also, Gilgamesh gets to use it in FF8 as well.
AWWW!!!Dude I remember that thing! That was freakin' A!
I'd have to say that my favourite sword is te Gunblade. Second is Cloud's Buster
SWORD, not blade, because, well, you just gota love the "Impossibly large, and way too impossible for someone of Cloud's size" sword idea. Of course, I also like Sephiroth's Masamune, for one reason, and one reason alone. The Masamune is pure good. The Muramasa, is the complete opposite. Long ago, both were placed in a river, and two leaves came floating down it. One leaf was cut in two by the Muramasa, and the other leaf completely avoided the Masamune. That's why it has no blood on it when Sephiroth stabs Aeris.