Regarding Godfather: Blackhand and Scarface: TWIY, both are great games and will keep you busy for a good while. Godfather is the game you want if you're more of the torture-prone, brute force kind of person. The game definitely lives up to the name. You likely won't find a better control scheme for a shooter (or maybe any game) on the Wii. If you prefer shoot first, shoot some more, then ask questions, Scarface is your game. Scarface involves a LOT of running from the police, and is centered around cocaine smuggling. Godfather is centered around extortion and respect while working your way up the corporate mafia ladder. Godfather's music gets bland after a short time, while Scarface has a massive soundtrack featuring a few unlockable songs. It includes the movie soundtrack and a long list of other '80s, Reggae, and Cuban Jazz hits from artists such as Earth, Wind & Fire; Rick James; The Latin Brothers; and Third World (if the music matters to you).
Something else that might be worth pointing out; anyone know if Al Pacino has something against video games or otherwise reprising roles? He didn't provide the voice for Tony Montana in Scarface: TWIY, and he wasn't the voice or likeness for Michael Corleone in Godfather: Blackhand.