Which game should I get for what system?

Fallout 3 for X360 or PC? Is there a list of differences anywhere. This is the one I REALLY need help deciding.

Left for Dead for X360 or PC? I play CSS on the PC and love it. Which system do you think will have more people playing on it?

Try using the game recommendation thread that is stickied above, you may get more of a response.

Remember also to check the stickies in a forum before posting, most times you will be moderated for ignoring a sticky.