The original Life is Strange was it for me back when I first played it. I have to admit, I was feeling a bit down at the time, so the soundtrack, the atmosphere, and the emotions in the game really resonated with me. I'm actually a bit hesitant to play it again because I don't want to lose the special memories from my first time through the game.
The original Life is Strange is a masterpiece and I wish I could reexperience it anew. I played it twice to see how choices mattered and it's not quite the same the second time around.
The other Life is Strange games are also really great, but sadly they can't quite match the original.