Halo Wars:
The game is pretty good but nothing special, the sound, graphics, story and cut scenes are all amazing and very Halo-like. However the actual gameplay is rubish, you don't need to use any strategy to win any of the battles and the game is overly simple making it little fun.
Here's the average reviews score for Halo Wars:
http://www.metacritic.com/games/platform...
As you can see it's 82% meaning this game pretty goos but not really worth your money.
Street Fighter IV:
This games has amazing graphics, the characters are masterfully animated and are 3D while the arenas you fight in are classic 2D. The gameplay is a good mix of old Street Fighter games and also there's many new gameplay mechanics that greatly add to the experience and fun. You can't go wrong getting this game.
Here's the average reviews score for this game:
http://www.metacritic.com/games/platform...
As you can see it's 93% meaning this game is awesome.
So you should definitely get Street Fighter IV.
Have Fun!
