Hi,
Good question. It is very hard to compare the two. The Godfather PT3 is a fiction as where Goodfellas is based on true happenings. GF3 is also romanticized where as Goodfellas shows the brutality of being in the mob. Each has its place however. I prefer Godfathers ethics of Goodfellas senseless violence. Guys like Tommy DeVito are a dime a dozen and DON'T last long. The same can be said of the Nicky Santoro character in Casino. If you bring heat you have to go.