In this scenario, both sides more or less have 0 experience. Neither US nor China fought an equal power war since Korea.
Whoever gets cocky would have a signficant disadvantage. Service record and experience wise, both sides can only rely on simulations and training.
The significant tyranny of distance absolutely also doesn't help US, because not only are they untested, but they'll also need to overcome bottlenecked logistics, unfamiliar territory and attacking while having local firepower disadvantage.
If I gave the chances (to acquire major territory) of Russia's Donbass operation as a 7/10, I would give US' Taiwan operation a 1/10. Sure, one can say it is biased because I don't support American expansionism, but I'm evaluating realistically based on the fact that Ukraine is a lot smaller than Russia (in every major metric) whereas US is smaller than China in most metrics except starting military size. The geography also favors China a lot more.