Yeah, love me some CRPGs of isometric nature.
I don't find BG3 to be specially good full-fledged CRPG, especially if you look at it from Baldur's Gate sequel perspective (I gave it 6/10 for that), but it's great megadungeon crawl (or dungeon megacrawl, however you like to look at it) - that's what Larian's games really boil down to, so 9/10 if measured that way (for overall 7.5/10).
I'm not sure I can pinpoint best one, between Fallout 1/2, Planescape: Torment, Arcanum:Of Steamworks and Magick Obscura, BGII and some of the Ultimas, with maybe some of the newer in the mix, like Disco Elysium and Pathfinder, they all have their pros and cons.
CRPGs are the closest one can get (so far) to TTRPG experience in many aspects, yet they pale quite a bit compared to TTRPG experience, and I generally play them only when I don't have TT campaign running or playing in one, so if you have a chance, please do try actual TTRPGs.