CSS and Halo are too dissimilar to be compared like this. One doesnt have a single player worth having and the other doesnt have a multi player worth having, which actually makes the question do you prefer multi or single. Me, I dont like halo because its so overrated so ill go with CSS. At least its worth its salt
halo is better cuz its on xbox... if source was on xbox it would be better cuz i can use a controller i suck with a mouse.... XBL gamertag: CABOOSE 228
I would have to say halo because I have never played CS I have no idea what it is in the first place.