ME!

Actually, there is no such thing as a best bassist, much like there is no best guitarist. However, I'll give my little perspective on this:

Most Technical: Probably Bill D ickens or Victor Wooten.

Most Influential: Jaco, he pretty much invented the idea of a badass bassist.

Generally badass overall: Juan Nelson (Ben Harper), Norwood Fisher (Fishbone), Les Claypool (aka: THE MAN), Dirk Lance (Incubus), John Entwistle (The Who), Steve Harris (Iron Maiden), Geezer Butler (Black Sabbath), and of course BOOTSIE COLLINS!