To make it simple this is how it is:
PC / N64 - Original versions. Music has worse quality in N64 version
Dreamcast - Much like PC though with widescreen option, new level selection, extra mini-games, glob crystals to find and Globox village
PS1 - A lot less content overall, some exclusive areas, some different cutscenes, voice acting and a bonus 2D prototype level
PS2 (Revolution) - Added hub worlds, added music, added bossed, added cutscenes, added powers and added minigames
DS - Port of N64 version with some issues and worse graphics
3DS - Port of Dreamcast version without the minigames and Globox village and with the 1000th lum being glitched and of course with 3D support
iOS - Port of Dreamcast version without the minigames and Globox village
So most versions are similar except for the PS1 and PS2 versions.
If you've played the PC and DC version and want one with more content the PS2 version is the one you should choose
