Mt. Wuyi (Fujian) or Zhangjiajie / Wulingyuan Scenic Area

Hello,
I will be travelling to Fujioan and Hunan and I am interested to see both, Mt. Wuyi (Fujian) or Zhangjiajie / Wulingyuan Scenic Area. However, my plan only allows me to go to one of These places? If you would have the choice, which one would you select and why?
Thanks for your answer, Manfred