I think that a Call of Cthulhu adventure or campaign would make for an absolutely riveting TV show. Maybe Horror on the Orient Express or Day of the Beast.
Planescape: Torment and it's not even close. As far as I'm concerned it and BG3 are the only pieces of D&D media with actually fleshed out characters, and BG3 is so big it'd take forever to adapt. You can do Planescape-as-Sopranos easily enough.