Aren’t these countries already considered the closest rivals in terms of economy? Under Trump’s presidency, his policies on Bitcoin were generally positive, while China has maintained its stance on banning it. So what do you think? will the US’s adoption of Bitcoin help boost its economy and give it an edge over China, or could it have the opposite effect?
Being a bitcoin-friendly country probably is way better than being against it, it's pretty clear that bitcoin draws capitals and rich individuals, going against it is just stupid. China, for the way the manage things, probably don't like the fact that bitcoin can't be controlled by the government so they don't want people to use it. Bitcoin goes on the same list as Facebook, Youtube, etc, if they can't control it then they ban it, as simple as that.
Same thing ranochigo said - no matter how lucrative would it be for China to work with BTC, it would be a much bigger risk for them to have their people at least the possibility of pseudoanonimity and the outflow of funds through it.
Why do it when you can introduce a centrilized coin with lots of features to be in control?