They are both “good” or “bad” for the Jews, but in different ways.
Harris’s close alliance and past association with the Progressive (WOKE) wing of her party is very threatening since they are active anti-Semites.
Trump’s willingness to accept support from far night the anti-Semitic activists is probably less threatening, since the right-wing anti-Semites have minimal support whereas the left-wing anti-Semites are a large movement and probably control the Democratic Party.
MAGA’s isolationism is threatening to Israel (and the world) but is not based on anti-Semitism, whereas the Progressive position is that Israel (and Jews who support Israel, and all non-assimilated Jews are presumed to be zionists) is evil and should be destroyed (and they act on this belief by attacking Jews in America and around the world).