Michael Myers from the original and the 2nd. In those two flicks, he wasn't so much a slasher .. He was a stalker, a watcher, and that is scary as hell!!!

Michael Myers is the coolest when it comes to stalking and watching, jason is the best for the killings, Pinhead is the creepiest, Chucky is the funniest, Candyman has the best background, and Leather face is the sickest, thats my list