Mitsuda. I don't like very much FF music, limited to You're Not Alone, Fisherman's Horizon and the FFIV battle theme. But even those are nothing special compared to the credits theme of Chrono Trigger, Scars of Time, Dream on the Shore of Another World or Rainbow Castle from Mitsuda's Mario Party score.
Though Uematsu did compose the Brawl main theme. That was better than any of his FF work.
For the record, One-Winged Angel is one of the worst songs I've ever heard.