If the Skull Ghost would have stayed consistent in design with his first appearance, that may have made him my favorite. However, mid-way through the film, he suddenly changes designs and now is clearly a guy in a skeleton suit, so that brings him down quite a bit for me. I'd say my favorite is Beauregard's ghost, because of his creepy voice and amazing design! It's really cool too to have the ghost be someone related to Shaggy, because that adds a little extra creep factor IMO.
Let's check out the results from last week:
Which version of Fred do you like better?
Serious Fred - 40
Dimwitted Fred - 23