Well, we can't make a comparison between them. They came from different comedy style. Eddy grew up in black american neighborhood and that made him so creative in making jokes at people even rhyming. Jim was basically a bar comedian that provide more body and face joke. So, they are both great. Nobody better than other coz they have their own speciality.
im confude...both r equally geniuses in comedy acting..but wen it comes to disguises,eddie murphy is th champ...........jim looks almost same in every movie........