Personally, I'm a huge fan of Hollow Knight, Ori and the (Blind Forest/Will of the Wisps), and Kingdom Hearts. Orchestral soundtracks are just something else...
It's crazy what Andrew Prahlow (Outer Wilds composer) managed to make happen with Outer Wilds with a banjo. I feel the music adds so much to the game, and you can really see his skill in all the different genres of music within the OST, from comfy and familial with Timber Hearth, to the creepier Strange Flames
If you haven't seen it yet I recommend checking out the lost reels (It's the last 6 tracks). It's basically a sendoff to the game and the dlc and it's a work of art. I definitely cried a bit on my first listen.