If you only have time for one of the tour, I do suggest you take the Yunnan tour instead of the Guiyang tour. Since the road between Congjiang, Sanjiang and zhaoxing in Guiyang Province is not very good and sometimes there may be mudslide when it is rainning. For the Yunnan tours, you can experiencethe real China and you can also witness the Chinese Minority People's life. Anyway, this is my personal idea.