i only know the famicom, Master System and Turbografx versions of Ys.
According to Hardcore gaming:
JVC published two Falcom Classics compilations for the Saturn. The first package, released in 1997, contains a remake of Ys, alongside Xanadu and Dragon Slayer. The graphics obviously look a lot more detailed, but they're all a bit drab compared to the bright palette of the TurboGrafx-16 game, despite some nice new character portraits. The music, despite being redbook, also pales greatly in comparison, with very MIDI-esque arrangements. There's no voice acting or even much of an intro. But while the presentation screams "budget title," the gameplay has at least been suitably beefed up. While it takes a long time to level up (like in the old computer versions), Adol can finally run, as well as move diagonally. These small gameplay enhancements almost, almost make it better than the TurboGrafx-16 version. As a bonus, a certain version of the Falcom Classics bundle comes with an additional CD. It contains a CD drama, as well as a video of one of the voice actresses taking a tour of the Falcom store in Japan (and losing terribly at a game of Ys).
The second Falcom Classics package was released in 1998, featuring a remake of Ys II, as well as an older Falcom game called Asteka II: The Temple of the Sun. It seems like JVC put a bit more effort into this one - there's some voice acting, as well as an anime intro, and even scenes from the original Ys game with voiceovers, as if the publisher was trying to make an apology for the previous release. Otherwise, the enhancements are pretty much the same: more detailed graphics but less vibrant, and mediocre arrangements of the music. The second CD included with the limited edition simply has some music selections from Ys II and Asteka, since they aren't redbook on the game CD.
http://www.hardcoregaming101.net/ys/ys.htm