I find the saturn version to be superior to the original Playstation 1 and Xbox360 versions of SOTN.
and in some ways superior to the PSP DXC version of SOTN as well.
*all 3 characters playable from the start (with the most gorgeous character select screen outside of Castlevania HD.)
* while NITM Maria is OP compared to DXC SOTN Maria, some like her NITM moveset a lot more.
* also Nocturne in the Moonlight is the only version with Richter's proper SOTN era costume/appearance playable
*added locations that expands the map further
the exclusive Sega Saturn SOTN material:
Saturn Enemies & Bosses - 18 enemies were added, 2 of them are bosses (Maria Renard and Skeleton Leader).
Saturn Maps - 4 new areas of the castle were added which contain these new enemies, Cursed Prison, Underground Garden, Soul Prison, and Hell Garden.
Saturn Monster Encyclopedia - The Saturn version has a different Monster Encyclopedia, which includes the new enemies.
Saturn Characters - Maria Renard and Richter Belmont look slightly different.
Saturn Instruction Manual - The complete Instruction Manual for the Sega Saturn version.
Saturn Case & Disc - The Saturn Case & Disc displays different artwork.
http://www.castlevaniacrypt.com/sotn/saturn much of what Saturn version has to itself makes up for its technical flaws.
with added polish it would be the undisputed definitive version.