If Trump wins we get a whole much more Trump nominated federal judges.
No. You get Putin defacto in control of an American government, which will pass laws increasingly enabling powers that will result in a democracy in name only, of which the Supreme Court will evolve to be a rubber stamp, the press is state sanctioned, the military is ever more a weapon of the dictator - Putin, in effect.
Upside. American influence in the world has been on a slide for well over a decade. It started with W, Barack was internationally popular but not overly influential, tanked with Trump and had a small but significant temporary resurgence under Biden.
There were already shifting alignments and a move to lessen American foreign influence internationally. The EU will become the beacon of democracy and the counter-Russia strength. Israel will become more isolated and more of an isolated, radical regime as the Middle East evolves ahead of it. The WWII Israel taboo has been broken.
A majority of Americans have never left the country, a majority of those not even their own state. The fact that essentially half the country can vote for a Russian asset, fraudster, rapist, racist and self-proclaimed totalitarian who is 'married' to a high end East Euro hooker who comes from a Communist country and whose parents were known KGB assets shows just how inward gazing and intellectually absent far too many Americans are, and it won't be fixed in a generation.