First COD to have dive-to-prone (dolphin dive). BO2 is the better game to play in terms of system link, because it has more modes and bots. Don’t choose though, both games are legendary – play both.
Change of pace for COD with maps that make camping and sniping more common, yet TTK is fastest of all CODs. First COD to have sliding. Safeguard is a great wave survival mode for 4 player co-op against soldier AI on the multiplayer maps.
Fun for beginners. Simple controls. Classic deathmatch and great capture the flag. You can press down on D-pad to fake your death and then pop right up to surprise your opponents.
No reason to play the X360 version on modern consoles, since XB1 version runs better, with better graphics, and allows more players. No crossplay with Xbox One version.