PowerAmp, hands down. Using the XposedMTC, My steering wheel controls work awesome! Vol Up/Down, Mute pauses the track, Up/Down arrow changes tracks accordingly. Well worth the $.
I installed PowerAmp, and installed XposedMTC 13, but I can't seem to get my buttons to work at all even the ones on the stereo don't work.
What version of XposedMTC did you use, did you have to use a special setting?