Yeah iv'e seen a few things about him, thats the nutter who was killing whore's down by the riverside, he also killed a little boy, he also claim's to have killed a girl in vietnam, an ate part of her! although never prooved.
Hahahaha, nice choice Bank Robber. Zodiac Killer is a classic. One of the only serial killer to never be caught.
If I had to choose, I'd probably say 'Jack The Ripper', but David Burkowitz was pretty fucked up also.
edit: I forgot about Ed Gein, dude made a woman's suit out of real women's flesh and had human skulls on his posts at the edge of the bed. Made a wig outta real human female hair and shit.
When the cops first stormed into his basement they were sure that they hit hell.