Powder King lives up to it's name but the hill is a fucking joke, two old slow chairlifts, no amenities, and the road up there can be really really dangerous. I haven't been back in years but I hear they have a terrain park now. Bring your backcountry gear and talk to someone who knows the way out, thats where the most fun is.
Purden is well kept but it's small, rarely any powder, no park, two chairlifts, and it gets boring quickly. Tabor mtn is on the same highway but closer to Prince George and it's really shitty.
Smithers is nice for backcountry riding like Powder King but really boring for everything else. Plus it's a long way to drive.