What's your favourite S.T.A.L.K.E.R. game?

Aside from the free-to-play mod Anomaly (read the article about it here: https://gamefreaks365.com/best-free-to-play-survival-horror-fps/), what’s your favourite game of the franchise? There are three games: Shadow of Chernobyl, Clear Sky and Call of Pripyat. All three are exceptional in their own way, but without mods, they’re somewhat underwhelming. My favourite is Shadow of Chernobyl because of its atmosphere and the story. What’s yours?

Sadly, I have never played one. However, STALKER 2 looks great. I’ll play that once it comes out on Xbox Game Pass.