I'd say on foreign policy alone Trump is a potential minor improvement.

Trump has no political loyalty beyond himself. He could absolutely be convinced to pressure Israel depending on the media cycle. 99/100 he'd end up being about the same but there's always the off chance that his idiocy leads to a good outcome. Something like demanding other NATO states contribute to Israel and then blowing it all up when none of them do. He's unintentionally contributed to de-dollerization and a weakened America Empire.

Harris knows exactly how the sausage is made and she's an full-throated supporter. She will never have a better outcome because she is ideologically committed to the worst outcome.