The various versions of wipeout

I own the pc version of wipEout, wipEout 2097 (psx), Wipeout 3 SE, and wipeout Fusion.

i was wondering if there's some differences between:

wipEout for PC, PSX, and Saturn. (i.e. i keep hearing that wipeout for saturn have worse graphics but faster gameplay)

wipeout 2097 (psx-saturn) and wipeout XL

and LASTLY if the soundtrack varies between the various versions.

Thanx, Karsten