All candidates will be equally “good for the Jews” except for Sanders who would be a disaster (he is a socialist, allied in the past with the ultra-secular vehemently anti-Torah factions in Eretz Yisrael, and his policies restricting personal freedom in favor of state control of personal decision making would trample religious minorities).
Given the two “dark horses” have risen to leadership in both parties, any predictions are meaningless. One most issues Trump is a conservative Democrat (think Henry Jackson, Hubert Humphrey, Franklin Roosevelt, John Kennedy, Bill Clinton as he was in 1992) – except for being loud and somewhat bigotted he’s a classic RINO. Sanders is a hard core socialist (note how he honeymooned in the “workers paradise”). In stead of guessing based on polls, one might as well throw dice.