The MS-DOS version of Rayman was the best one. All of the console versions had to cut various things from it. Lower resolution sprites, removing layers from the soundtrack, etc. The Sega Saturn was probably the closest to the MS-DOS version, and that one isn’t included in this edition.

I’m not really sure if this new $20 edition is worth it. You can get the MS-DOS version, plus all of the bonus levels mentioned, for $1.50 right now. https://www.gog.com/en/game/rayman_forever