COD4. But I Wanna Bring This Up. Tell Me, Do You Guys Think COD Games Are Better When They're About WW2? Or When They Make Up World War Three? I Think COD3 Was The Best For Online. Story Line Got Boring Sometimes, But Online I Loved Using The Kar98k And Blasting Everyone. Sorry For Changing The Subject. XD
i say call of duty 4 becuase u make your own classes, customize your guns, 18 player online matches, great storyline, and it has a better ranking system. halo sucks, you cant customize anything except maps and game types, it has cornier maps than call of duty, the gameplay isnt that good, and halo ranking system sucks, you can beat like 12 ramked matches and go up 1 skill point but when you loose 1 you go down.