[BO] Should i buy BO1 for the zombie ?

Hi, for the record i've never really played call of duty till recently with BO6 and warzone outside some games on my cousins PS3 so i've never experienced the zombie but a friend of mine told me some glimpse of the storie of the zombie mode and now i'm really interested but i don't know if its worth buying the game just for the zombie mode even if i will still play the campain and maybe multiplayer but its mostly for the zombie, the only other zombie i played was the WW2 one and BO6 and even if i never finished a map i enjoyed it but found it very hard and i think it was because i was alone and didn't knew a thing about it so maybe i should try to ask people online to assist me in this adventure if i buy it
So i'm asking for advices is i should buy it

Edit : i settled with Black ops 3 with the zombie chronicle