For me it’s
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Resident Evil 1 (1996)
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Resident Evil 2 (1998)
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Resident Evil Outbreak (File 1 and 2 because it’s pretty much one game split into two)
1 will always hold a special place in my heart since it’s the first I played. 2 because it improved on everything that 1 did and it was the first Biohazard game I played to completion. Outbreak because it took the series online and introduced multiplayer while still sticking true to it’s survival horror themes.
Oh yeah multiplayer was where it’s at, never to late to try it out though as fans have kept the game alive via private servers you can easily connect pcsx2 up to.