My vote goes to Homer for two reasons: 1) Think back to one of the treehouse of horror episodes where it turned out that Flanders was the devil, Homer ate the forbidden dought thus signing his soul over to Flanders, on the other hand Peter IMHO would have more than enough sense to not eat the damn thing. 2) In a miscellaneous Simpsons episode Homer got a computer and when the press any key window popped up he got confused and didn't know where to find the any key, Peter though has a computer and knows how to operate it now I will admit he's dumb as dirt but Homer is dumber. Oh and another thing Peter only forgets Megs name except for in one episode when he forgot Stewies.