I think most trainers have something to offer, but I think Clint's way is more adaptable to various horses and situations and has a bit more of a straightforward approach toward the horse (less tendency to give mixed signals). Though, I also think that people can use his method easily to abuse a horse that is fearful, and confuse fearful responses with disrespectful/aggressive horses (such as with horses that have been abused and learned aggression response vs. horses that have been spoiled and learned the same- the approach is a little bit different).
So far as who I'd like to ride my horse? My mare would teach either one of them a good lesson in humility because she really seems to have the mindset of "I gave you the right to work with me, so work with me right" (and your privileges may be revoked at any time if you get cocky about it, I'm still bigger than you"
(She really is a very sweet, willing horse, just a little peculiar.)