Which one should I go, of the 5 Panda Sanctuaries in Sichuan Province?

There are 5 Panda Sanctuaries in Sichuan Province as below,

1. Chengdu Research Base of Giant Panda Breeding Base(Chengdu Panda Base), 16km away from the city center, established in 1987,is the best place to see pandas of all ages,well designed facilities to watch over 50pandas there.

2. China Giant Panda Conservation and Research Center Wolong Base, 133km away from Chengdu,the capital city of Sichuan, it is the first panda sanctuary in China,unfornately it was badly damaged by 8 magnitude earthquake in  2008.

most of the pandas there have been moved to #3 and #4, the road to Wolong is quite dangerous,lot of landslide,so not recommended to go there.

3.  China Giant Panda Conservation and Research Center Bifengxia Base,140km away from Chengdu.  After the 2008 earthquake,most of the pandas from Wolong had been move to Bifengxia,and stayed there until 2014, when the #4 was built. Most of the Pandas in Bifengxia has been moved to #4.

4. China Giant Panda Conservation and Research Center Dujiangyan Base, 70km away from Chengdu, was built on 2013, so far it's home for about 40 Pandas. Taishan, born in National Zoo (Washington D.C)  is currently living here.

 And it's the only place in the world where visitors can hold a baby panda,after all the other Panda Sanctuaries stopped this

program from November 2014.   The nature setting here is quite pretty, 2km away from another popular tourist attraction QIngcheng mountain.  This panda facility  focuses on Panda disease preventing and controlling as well as wild pandas rescue.

5. Chengdu Rsearch Base of Giant Panda Breeding Dujiangyan Base, 70km away from Chengdu, open to tourists from 2014, it's home for 16 pandas. This facility focuses on Panda training and releasing into the wild.