If I had to pick one to keep and lose the rest it would Realtracks (easily).
If I was picking the one that impressed me the most it would be the ACW. Tempo and Chord maps all laid out in a couple passes usually. The Tempo mapping part is at least as important as the chord recognition.

I have been given a project with the chords supplied .. but needed the Tempo map for a click, RTs etc.

I do not work here, but the benefits are still awesome
Make your sound your own!