My querry was only on pure sound terms. If I plug my headphones to mojo, and to the pioneer playing the same mp3 file say in the mojo case from usapp pro on Android, which one would sound better? I am only interested in knowing which device "sounds" Better for the same song.
I personally think no one will feel the difference if blind test is made. And what does "better" definition is? What sounds better for me may sound worst for you.
I purchased Onkyo DP-X1A (twin brother or Pioneer) and believe it sounds fantastic on my Shure SE846. Onkyo can't drive my Oppo PM1 and PM3 cans with authority which is why I use those with A&K Kann which also sounds great.
If Pioneer is able to drive your headphones or IEM who bother adding a DAC?