It is the obvious choice for Oden, moreso because he can't expect to have a long and healthy NBA career. If he can only play for one season, why not go with the best player on the planet, and a place where he can sit out, whenever he needs to.
I wouldn't be surprised though, if he can't take the heat (so to speak). His health issues also resulted in a mental breakdown (drinking problems etc.). I hope for him that it is all behind him, but it has probably taken it's toll on him.