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Wrong board friend. Take it to /v/ hehe this is for generals (dedicated ongoing discussions of specific games) not for threads as such. However, to save you the trouble:
Stalker is more open ended with serious gunplay and a superb atmosphere. It really forces you to take your time and not just rush headfirst into a gunfight.
Metro is basically call of duty in comparison. It's not a bad game by any means, but the closest to the stalker series would be Metro Exodus (not even worth picking up the first two in my opinion, as they're solely linear story shooters)
Tldr, stalker is the only option.