Which music-ID app uses less data? Soundhound or Shazam? I've found Shazam and Soundhound to be pretty much identical in terms of accuracy when identifying music, however I tried monitoring each app's usage with 3G Watchdog but couldn't get a clear winner between the two, so the question remains:

Which app uses less data?

I looked at the answers for this question: [ How can I choose between Shazam and SoundHound? ], which compares the two, but no information .was provided on data usage.
Only one way to find out. Recognize 10 songs with each and compare results. No way the data traffic results are the same. You'll need some population (more than 1 tests and take average) in order to get some results.

Ideally you would test with the same data but that is just impossible. Unless you have 2 devices checking the same sound at the exact same time... Still I guess you would be able to make a good comparison with different fragments of the same song on a single device, alternating soundhound and shazam.

What you really want is an app that stores the recorded sound to analyze later on when you're on a free (or at least much cheaper) wifi network. Only reason for this question is you have to watch your data traffic, no?