I own both...I completed Godfather a couple of months ago and loved the game. I was so good with the controls that I had each warehouse down to a routine. The way I controlled the game, a commercial should've been filmed that would've doubled the sales (**exaggeration**).
Honestly, Godfather controlled very well. It was the first non-Nintendo game outside of Raving Rabbids that really took advantage of the control. From the moment you're grabbing thugs and slugging with whatever hand you felt like digging into their cheeks...or actually deciding you wanted to choke 'em...this game made it easy.
Scarface comes along...and the cursor control makes it different. Prepare yourself of the learning curve that will take at least 3 hours of continuous play to master. There was an option to use a similar control in Godfather, but many of us opted to use the simple lock-on mode, which is also present in Scarface.
Scarface shines in...graphics, the RPG elements, and the under-appreciated street racing. Let me 'splain:
The graphics are much more brighter, much more detailed, there are more alley ways...as a matter of fact...there are alley ways everywhere in this game. You could cut through blocks and come out the other side of a chase through an alley way and lose whoever was chasin' you. The environments are never the same. Godfather was too much of the same look...going in and out of buildings that were designed exactly the same way...the rackets looked too much alike.
The RPG elements. All the Godfather "DON" stuff and abilities are cool. Calling a hit squad to take over a rival gang HQ was awesome, but all that stuff is made much more deeper in Scarface. The "Exotics" in Scarface bring much more funk and replay level to the game. There are a long list of cars, boats, and stuff to do with the mansion that go beyond what the Godfather has accomplished. There's much more customization.
Finally, the street racing episodes of the game are well-designed. Some of these races are almost games in themselves. I would recommend all of the races in downtown. The have the simple ones through the city blocks, but when they start to take you through the construction dirt roads of the game...that's where the fun is...prepare for some good old fashioned arcade style racing. There's also one long course that will take you on the freeway and through some...uhmmm...lemme not spoil it. Good car controls...make for some easy arcade racing.
Scarface's cursing does get annoying, as someone in here as already pointed out, but the conversations that you can complete are fun. Godfather's gunplay/fighting controls are still better, which important in a game, but once one comes to grips with the control scheme in Scarface, there's fun to be had in a serious way. You're forced to use the Wii Remote like a mouse and navigate.
SCORECARD:
Graphics: Scarface
Gameplay: Godfather
Presentation: Scarface
Fun Factor: TIED
Replay Factor: Scarface
OVERALL: I would recommend both because they're great. If I had to pick...I would pick Scarface. If you wanted to play it in front of some PG-13 crowd...play Godfather.