Superman is so lucky when it comes to music, though. All his themes are memorable and inspiring.
I voted for Fleischer, Williams Superman theme, the animated series and Man of Steel. All these themes are great and make me feel the wonder of Superman. The most iconic is without a doubt Williams. It feels more universal and captures the wonder and majesty of the character perfectly. Man of Steel is great too, but often it feels more specific to that incarnation of the character rather than general like the other themes do. Notice how most of these themes almost say "Superman!" in one part. It's funny and interesting.
Definitely adore "First Flight" from Man of Steel too. It's very riveting. Makes me want to cry for Clark.
All Star Superman is another favorite. It's really quality and makes the movie even better. That's what the more recent animated movies have lacked, great music.
And last but not least, I adore the Krypton theme from Superman the Movie. It feels so epic and majestic! It makes you feel you are going to watch something really special.