Good question.
Generally you cannot tell by what chip or some design detail. The overall design makes the difference.
I own an A&K SP2000 (?)… their flagship a couple years ago. It sounds good for a DAP. One could argue that because it is battery powered (lowest noise power) that it will sound better. But my experience is that full sized stand alone components virtually always sound better. I think it is because cramming all that stuff together in a small space creates major sound quality compromises.
I have owned dozens of portable devices and full sized components. I would guess… and this is a guess the Innous Zenmini… or other full sized unit… I am not familiar with the Innous.