I like all the swords in MM, too bad you can only get stuck with one at the end(Guilded Sword) but I love the Razor Sword(3 hits and its gone, wow, uhorrible Nintendo), the Great Fairy Sword(which stupidly it's a C-item) and the Fierce Deity sword.
I also like the good ol' Master Sword(especially the Wind Waker design) and Giant's knife.
Oh and wheres the love for Spirit Tracks? The Lokomo Sword has got to be the most bad-as* designed of all the swords in TLoZ!