Which is superior? Badaling or Mutianyu? If I can only go to one which shd it be?

Actually, it is hard to tell which is superior. the two sections of Great Wall have their own characteristics: the former is more attractive and the transportation is more convenient, and the latter is more graceful. In general, there are more visitors of the former one than the latter one.
I have visited the former, so if I had a chance, I would go to Mutianyu this time.