Godfather was really great. I don't really like the GTA games (at least GTAIII and Vice City as the ones I've played) They're okay, but I never had the desire to finish them.
I think what appeals to me in the Godfather and Scarface is the empire building and character customization. Plus they don't seem to have as big of emphasis on driving and since I don't like most timed races that's a good thing.
Scarface does have nicer graphics and music than Godfather.