Mine is agoprom underground as it was the first proper showcase in the series of the dynamic lighting from torches and muzzle flashes along with a wide array of things to fight in the tight dark corridors.
mine is probly kinda unpopular lol, the great swamps, clear sky was my first stalker game and i always pick clear sky as my faction for anomaly and stuff and i really like places like the pump station and the church
ngl i know stalker 2 is kinda shit but i really enjoyed seeing the swamp and zaton and cordon recreated in 42069p and with RTX ultra raytracing or whatever
I remember spending hours in the swamps messing with the faction wars and forgetting that there even was a continuation to the game. Also nerding over them dx10 effects and watching this trailer like a religion https://youtu.be/YAYLHAPPkvw
When I actually got my hands on clear sky back in the day it didnt even start lol "xray engine has stopped working"
Gotta be Pripyat in Call of Pripyat, it's maybe a bit too empty, but that adds to the atmosphere to some extent. That's something I actually really appreciate about CoP, it doesn't feel the need to throw enemies at you nearly everywhere you go, it's content to just let you wander around a pretty much empty factory complex and jump at shadows.
Limansk from Clear Sky I like conceptually, but the actual level in-game is mostly a linear shooting gallery, unfortunately. But still, I'm just a sucker for exploring decaying urban environments