This is not a heavyweight boxing match. IMO there is no equal by a very large margin in capital,
equity , debt and currency markets to the US markets. Confidence, depth, liquidity, freedom in markets, governent and federal reserve is on example with each global crisis despite protestations and wishes it weren't so.
IMO the issue is the relative capital flight (inflows) effecting equities and assets outside of Chinese capital controls that can inflict damage.
Remember the global market stir the 2015 /2016 Chinese capital flight /stock selloff caused?
Remember Jimmy Rogers yaers ago speaking of potential profitable opportunities he let pass due to risks of certain countries internal systems.
Chinese pain will translate directly to US market pain and I have no doubt the US can inflict more pain than can the Chinese to the US directly.
At 80 bil month POMO the fed was a much larger bid than was the rest of the world and could fill this gap again and dampen a rapid deflation supporting markets in a crisis...as usual.
China , I guess , can do the same, again, with rigid capital controls and , well, maybe there is further room in this fiat currency thing on both sides.