anchor: You will find their guides are much more reliable than those outside the temples or palaces, but one word of different tour guides will give contradictory explanations about the significance of statues as well as many different versions of legend and historical fact. 
positive: Though their guides are much more reliable, you'll find that they often differ in how they explain objects and legends.
negative: There is little difference between any type of guide because they share a common pool of knowledge and facts.