It's hard to say, as their respective portfolios are all pretty impressive, but if I go out on a limb, I would probably give the accolade to Darren Korb (and Ashley Barrett), who have been responsible for most of the music present in Supermassive produced games like Hades, Bastion, Transistor, and Pyre. My reasoning here is that time and time again, they smash it out of the park with back-to-back projects, so they would probably be the most prolific and reliable artists in the field.