I would recommend all of them for the different qualities. Get the original for the vintage sound that they originally went for.
Get the soundtrack SPECIFICALLY for Tisha Campbell, Tachina Arnold, and Michelle Weeks - NOONE sounds better than these three!!!(also for the songs that were added for the movie)
Get the revival, not only for the new renditions of songs, but they also have extra tracks from songs that were cut out of the show.
"Do you know what pledge time is, Andrew"? said the PBS Executive.
"Yes", Lloyd Webber replied. "My 50th birthday special must be one program that gets done a lot."
"No", mused the man from PBS heedlessy. "Not so much. Our Stephen Sondheim Carnegie Hall concert. That's a big one."
Spoons, forks and knives seemed suddenly to suspend their motion in horror, all around the table.