It 100% would be better. There is nothing in modern Chinese history that remotely approaches the level of imperial devastation the US has wrought on the world. This is not up for debate by any serious person. How many countries has China invaded recently? How many coups have they instigated? Is their “foreign aid” designed to help countries develop, or to extract as much wealth as possible while keeping them impoverished, underdeveloped, and dependent on the west for their most basic needs? Has the standard of living in China been going up or down in recent decades? Now ask yourself the same questions about the US.
Yes, it would be cataclysmic. In the longer term though, I would argue that just about everyone on the planet would be a winner if the US empire were finally put down. You can’t really overstate how much of an impediment the US is to global human welfare and development.