I agree with the Pierat, the instrument doesn't matter as long as the music is good. And fast guitar does not equal good guitar.
That said, I still prefer the sound of a bass to the sound of a guitar. I just find it has more depth to it. And it sounds funkier.
http://www.youtube.com/watch?v=SZDdrUi1HzI
"In 1986, after the death of Metallica bassist Cliff Burton, Claypool auditioned to play bass for Metallica, playing the song "Master of Puppets" on his bass. In Metallica's Behind the Music, Claypool said that during the audition he wanted the others to "jam on some Isley Brothers tunes," after which Lars Ulrich asked whether he's "not really used to playing this kind of music." James Hetfield remarked that Claypool didn't win the job because "he was too good.""