It is horses for courses: the PT6 can be maintained and operated in third world countries and will run in a satisfactory manner, but a TPE331 does require an amount of skill and precision from both pilots and engineers to get the best out of it and not cook it.
Both engines are excellent in their respective niches. In saying that the 208B does require some serious horses to perform in anything greater than ISA and the TPE fits the bill there.