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I only like the first one tbh
SoC was the best for sure, but CoP was pretty nice, too. Certainly a lot better than that pile of broken garbage Clear Sky. For that shit alone GSC deserved to go belly-up.
I always saw STALKER games as sandboxing games, and Call of Pripyat is the most polished one out of it. I won't deny SoC and CS has their charm, but CoP is really up-to-date.
Try the Call of Chernobyl mod. With addons, if possible. The ideal STALKER experience, in my opinion.
Mak, that is the essential mod for Call of Pripyat, all the time.