I like both. I'm not concerned with Grylls' faking it. I like his aloof and live-wire attitude, although he does come across as a bit careless as a result of his being accompanied.
Les seems to not succeed enough that you get a real sense of survival situation, although I think he tends toward the dramatic with his emotions at times.
Ray Mears is refreshing, even though not current, as far as I know. He has such a pleasant gentle-giant sort of vibe, and likes to impart a spirituality, which I enjoy. Maybe I will find more of his stuff at his site.
There are simply not enough shows of this kind for me to thoroughly nit-pick. They are truly something to appreciate.
They all obviously love wilderness, and that is something everybody need to discover in themselves.