Both will give a green light to discrimination against Orthodox Jews. They will also incite “racial” anti-semitism, especially Sanders since in this case a Jew will be blamed for a massive economic collapse. Sanders is likely to do the “politically correct” thing and support Palestinian terrorist attacks directed against Jews anywhere in the world, whereas Bloomberg will actively oppose “racial” (“ethnic”) anti-semitism (meaning he will object if non-frum Jews are killed, even by terrorists).
The best solution for our community is for Trump to win by a landslide. Trump may be”bad” in many ways, be he is not anti-Jewish, and his overall policy of support religion will work in our favor.