I found myself in big trouble to pick a better one between these two amazing movies. besides The Godfather, these are my two favorite films, I just don't know for sure which one ranks 2nd and which one ranks 3rd.
if I had to pick one of them, I think I would say GoodFellas is a little bit better, just for one little reason: I didn't find any boring scenes in the whole GoodFellas, while Pulp Fiction has one: (in my humble opinion obviously) the monologue when that guys tells young Butch the story of his father's watch.