I can tell you that I've spent countless hours comparing the Hiby app, Jet Audio, Poweramp, Audio Player Pro and Neutron. Neutron was less than fun for me and it fell out of the mix. I used to think all the apps were very close , or, in that with tweaking things you could make them virtually identical in sound. I still do by and large feel that way, with APP the exception. One thing I like to do is get an app to sound it's absolute best with whatever means available, then do the same with another, and then back to back compare. Then I'll back it up and bring things back to stock , or default, making sure volumes are close as possible......EVERY SINGLE TIME Audio Player Pro comes out ahead in dynamics, clarity, definition and punch. I'll add that the APP eq is outstanding (soundwise) and the difference is always more noticeable when comparing players with EQ engaged . It's a bit of a pain to use , but in the end I'll get the Andros at pure bliss and I'm close with with Poweramp but not quite there. (sheer determination, says I'll get there) Poweramp, Jet and Hiby all pull ahead with being able to tweak the soundfield , YET, Poweramp is so much better at the entire experience that I use it 10 to 1 over the others. I'm using the Aurora skin which I like a bit more than stock.