China is still pretty far behind on all sorts of tech.
Stealth: China just figured out how to hide the exhaust inside the airframe, the US was doing that in the 70s. They don't have stealth missles the US has thousands.
Missles: China has missles fueled with water, liquid fuel are less stealthy than solid. China is much closer here than most areas.
Logistics: US cargo planes can cary more farther. Russia has shown what bag logistics can do.
Boats: while China has more boats they are less capable. China has two aircraft carriers with one on the way US has 11 with 5 on the way.
Asymmetric warfare: US has demonstrated capability to handle drones and cruze missiles in a real world scenario, no one else has.