Apart from cosmetic (different bumpers and a rear spoilet) they also have sportier seats with larger lateral supports. Unnassisted steering models will have a faster ratio rack than the LX (slightly harder to steer but much sportier feel).
Some Super S in the UK have ABS. These vehicles will have rear disc brakes and a larger brake master cylinder/booster system along with the ABS setup. All others will have rear drums.
In your country also there are 1.0L micras. All super s are 1.3L, i'd imagine the majority of LX would be 1.0L's. There is a very significant performance difference between these two engines. The 1.3L is EASILY the pick - its got just enough power for around town and its also a competant highway cruiser. They will both use the same amount of fuel.