Caspar von Everec, puts the case that China would defeat the US in a conventional war, if held today. This is not a fringe analysis either, since official war game modelling has revealed the same thing. Usually such models do not consider the main line of attack of communist China, of using EMP, electromagnetic pulse attacks, to fry the electronics of the US. The US is vulnerable to this, and a study by Dr Peter Pry showed that even Iran might soon decide to polish off US society using the nuclear bombs, when they have them, and Pry believes that Iran already has such weapons. China and Russia have super-EMP weapons, but this is surely over-kill.
https://www.eurocanadians.ca/2022/04/china-would-defeat-the-us-in-a-war-if-it-was-fought-today.html
