It's been mentioned elsewhere in this thread, but it's worth reiterating - safety.
China is one of the safest places in the world. I literally never had a single concern for the physical well-being of my mother, my wife, anyone - no matter what part of the city they were in, or what time of the day.
Worth mentioning that I've found Singapore to be the same.
Contrast that with life in Australia (Melbourne), where I was constantly on edge even in the early evening, I'd worry every time my wife was out late, not to mention the instances where I was physically threatened or assaulted.