What is your price range? If you are not locked into these two hotels I can think of many others that are probably in the same price range that would be better.
As far as those 2 I'd choose the Great Wall Sheraton just because it's closer to the airport and getting to the Crowne Plaza during rush hour is a huge traffic hastle. I assume you're talking about the Crowne Plaze Wangfujin...is that right?