I crunched some numbers on this to get an objective answer. Up to 01/20/2021, 402 K Americans and 2201 K people died as a result of the pandemic so up until that point, 18.26% of all COVID deaths occurred in the US. As of the posting of this question (10/08/2021) a total of 711 K people died in the US and 4,849 K deaths occurred in the US (since Biden became president, 309 K Americans and 2647 K people died worldwide) so under Biden 11.67% of all COVID deaths occurred in the US. So relative to the global death rate, Americans were dying at 1.7 times the rate under Trump than Biden so if Trump won the election, we probably would have had an additional ~174 K Americans would have died. Although to be fair to Trump, I think there could have been worse outcomes. For example, if by some fluke Jo Jorgensen won, I think we'd be looking at an additional million deaths.