Tremendous Pain is my favorite, Fat Cry and Do It come close. But all the songs have a certain charm to them, and as usual Yello never fail to deliver good instrumental tracks.
Two things I noticed:
1) Soul on Ice off "The Eye" was obviously inspired by S.A.X.
2) It sounds like Zebra has a storyline of some kind, I first noticed this when hearing familiar words from Suite 909 in Tremendous Pain's lyrics, and later I saw an interesting pattern in the track names. Coincidence?