Here's what wiki says on PS vs Saturn:
"in the Saturn version use the Saturn's standard Cinepak software compression method, which, in spite of unusually clean encoding in this case, still tends to display more compression artifacts than seen in the PlayStation versions. As the PlayStation versions use a higher-fidelity M-JPEG compression for the cutscenes, the game was extended onto a third disc for the Japanese and English PlayStation releases.
The PlayStation versions include a variety of features that were added after the Saturn version was released. The PlayStation versions feature one more cutscene than the Saturn version does. In the Saturn version, the first ending was simply still screens, while it is fully animated on the PlayStation versions. A number of bromides were added, and all bromides display at a higher resolution than in the Saturn version.
The Saturn version contains two new dungeons, while the PlayStation version adds an additional two, with a host of extra monsters and items to attend them."
Also, it does mention better audio on the Saturn. I removed the part because you already mentioned that.
