It's hard to compete with Uematsu because he has such a massive library. I can't go past him really. That being said, Shimomura's work on KH was fantastic imo.
Nobuo Uematsu (FF series)
Yasunori Mitsuda (Chrono & Xeno)
Yoko Shimomura (KH series)
Masashi Hamauzu (FFX, DoC)
Hitoshi Sakimoto (Ivalice Alliance)
Noriko Matsueda (FFX-2, Bahamut Lagoon)
Junya Nakano (FFX, FFIV DS, ?)
Other
It's hard to compete with Uematsu because he has such a massive library. I can't go past him really. That being said, Shimomura's work on KH was fantastic imo.