Steam; Battle.net; I don't have a network account Next OK Continue Sign Up! OK. Skip. CALL OF DUTY, CALL OF DUTY LEAGUE, CALL OF DUTY MODERN WARFARE, MODERN

Steam is a better platform just in general unless if you want your call of duty's to be all in one place. Apart from that it doesn't matter which you get it off. If you are opting to buy on steam just make sure you link your steam account to your Activision account. battle.net requires phone number to play.

is call of duty on steam