The Horten Ho 229, with its stealth capabilities, could have
penetrated American or British radar systems, either attacking it's
targets by surprise or leaving the defending force without enough
time to scramble their aircrafts. The speed and aerobatics of the
aircraft, which was proven to out maneuver the Messerschmitt Me
262, which was the first jet fighter, would have destroyed other
aircrafts with ease. If the aircraft had made it to mass production
it would have either turned the tides of the war or at least
prolonged it, which would have made time for the Horten Ho 18,
which resembles the B-2 bomber, to be used to deliver a Nazi
nuclear bomb by 1946, although there is no evidence to prove the
Nazis were that close to creating a nuke. But the Luftwaffe, the
German air force, did not have many veteran pilots, if any, to make
the most out of this aircraft. It's hard to say if it was able to
win WW2 for the Germans.