NGC or PCGS ...... it doesn't matter, value is the same. IF you insist on buying modern bullion graded, buy MS70. Buying anything less is basically an overpriced raw coin. Buying these as an "investment" is a long shot at best.
I collect Pandas, both raw, in an album, and a graded set. When people tell me how collectible these (2015) are going to be, because of the lack of weight and purity, I tell them "yes, only you and me and 8 million other people will have one"
Just for comparison
2014 Libertad........429,000
2014 Britannia.......100,000
2014
Kookaburra......500,000
Of course, I still have my 2015 PCGS MS70 Panda, my raw Panda for my Dansco and an additional 2014,2015 and (2016) for my before, during and after "transition" to metric set.