^^omg, I agree about Billy Madison and its funny someone would say that because out of all the people I've known I am the only one who liked that movie.
But still, I don't think Sandler is very consistent. He is occasionally hilarious as in Billy Madison or Happy Gilmour and maybe That's My Boy but then the rest of his movies are mediocre or even terrible in some cases. So overall, I would give a slight edge to Jim Carrey.