China coins: PCGS vs NGC

I've been looking at Chinese coins on eBay and elsewhere. It seems like the pre-WWII coins are typically graded by PCGS and the modern PRC coins are typically graded by NGC. I've seen some older NGC graded coins but no modern PCGS graded coins. Is there a reason for this?
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Comments
1. Grading time for moderns $300 or less in value
NGC - 10 working days
PCGS - 25 to 35 working days
2. In my opinion PCGS grades to a stricter standard than NGC on all PRC coins and especially on Panda gold/silver and some collectors prefer an NGC69 to a PCGS68 even though it is the same coin.
3 NGC has a registry for China Panda coins.
I think NGC has graded quite a few more PRC coins than PCGS for both pre-WWII and modern material. Now that PCGS has a pop report for world coins, it may be possible to confirm or refute that.