I like mishima building round 2, g Corp heliport at night round 2, jungle outpost round 2, kazumi round 1, the original dumo di sirio stage theme, both rounds for devil's pit and dragon nest final round
Azure stage I didn't like so I switched it to shattered dreams which is my all time favorite theme
Kazumi's theme & Devil Kazumi's theme are also excellent. They're great on their own or combined on a single stage for epic fights. Violet Systems 1 is also pretty damn good.