Seriously tho, I don't really find either particularly scary, unless we're talking like lame birthday type clown that has a h*** in the head and dripping brains all over the place...
I'm gonna have to go with Clowns, I dunno why, i'm not scared in general of them, but thats a dying form of entertainment because of the perceived impression of fear people share.
Zombie Clowns will rule the earth !!!! what scares me more are all the idiots running around the earth.......Oh s*** there's one now........................ Kill em' !!!!