They have quiet a lot in common:
A dissapeared father as a WW2 pilot, neglected and abused childhood, drug addiction, pop idol stardom ,...
But they are different: as a movie (and after all a musical) Tommy tells a more comprehensive story, focussed on the outside world and thus demanding not too much concentration/empathy/imagination from the spectators as the Wall does.
On the other hand, pure musically, the Wall sounds more like a complete rock album and it contains a complete - though more introspective - storyline that doesn’t need visualisation. Easy to explain afterwards, as the Wall was in the first place an album, the movie (and no musical so far) came later on.
Conclusion: Tommy is better to watch (what a set list: Eric Clapton, Tina Turner, Jack Nicholson, Keith Moon) and The Wall is better to listen (even if you have the album on cd or i-pod, you will not shuffle or zap along the tracks but listen to it from its very begin till its very end).
Tommy: 1 - The Wall : 1
