Zelenskyy has done a lot of dictator like things with the war as an excuse like canceling some other political parties claiming they were too pro Russia, but it might be harder to play that card on a trusted General. Hopefully Zelenskyy will not succeed in getting the absolute power in your false dichotomy. Same with Biden or Trudeau. There are in fact would be dictator despicable leaders in the world.
Valerii Zaluzhnyi would have to go ahead with a coup. Zelensky was popular but I think his act is getting old now that the war is a stalemate.