Mono mix is a bit more rock & roll. Genuine mix and not a fold-down. Stereo has its charms, too. "2000 Man" is a deep cut classic and I kinda dig the trance-like "Gomper." "2000 Light Years from Home" is, hands down, the best cut on the album (and better in stereo, IMO). TSMR is more Piper than Pepper, if you ask me.
Let me know when you complete the maze.