Meaningful comparisons require reasonably accurate data, and there is nothing like that to be found in any of these countries. Aside from the fact that testing has been minimal for a number of reasons, different areas have perverse incentives to either over or under count COVID fatalities.
In the US, any and every death of someone who had the virus, and many who did not, are still counted among the death tolls. The recent case of the guy who died from alcohol poisoning comes to mind, though I personally know of others who died from other causes, and were counted even though they hadnt been tested.
Conversely, there is good reason to be skeptical of China's accounting as well- both due to government interference and the simple fact that they were not able to reliably test the majority of cases.