Confused By Ending? Great Analysis Found.
It does an excellent job at explaining Danys' downfall and why Jon refused the throne:
The reason why Bran was chosen and what was meant by "a better story":
Jon is compared to Frodo in "Lord of the Rings" who is able to refuse the corrupting power of the Iron Throne (The Ring) which is why he didn't want anything to do with it. Absolute power corrupts absolutely.
Bran can probably withstand the Iron Throne's power because he lacks a human personality. He's no longer really Bran.
It's a little long, but never boring and very insightful. Too bad that the writers didn't do a better job at getting some of these points across in the show.
Compares Dany to Cersei: