So Turbo is JUST faster SFII and Super is NOT faster but has more characters?
No.
Champion Edition added playable Sagat, M Bison, Balrog, and Vega plus new moves and colors.
Hyper Fighting (AKA Turbo on SNES) was a lot faster and actually balanced the characters they added in Champion Edition.
Super has new and touched up sprites and added T Hawk, Cammy, DeeJay, and Fei Long.
Super Turbo added Super moves and Akuma and sped the game up a bit.