As I wrote before you replied, *either* side of this debate could selectively choose some facts and ignore others to make either case; i.e. that China would either side with or against the U.S.
Yet on you go, doing that very thing. Yes, the Chinese went against us in Korea, then turned around and broke with the CCCP (allying with Nixon and even going so far as to unsuccessfully invade Vietnam).
It's simply too early to discern which side China will choose, based upon all of the currently available facts.
She *might* choose to fight us, perhaps even while fighting her own Islamic revolution in her Xinjiang province. Or she might side with her largest customer...who coincidentally is also at war with those same radical Islamics in nations that border China such as Afghanistan.
But it's too early to know for certain. Have an opinion, fine. Make a guess, fine. But she hasn't made a decisive move yet that would confirm her direction.
It's too early to tell.