A few years ago I had a Fiio product that sounded really fine when connecting it to a pc via USB. However, when I connected the dac to an iPad or iPhone using a camera connection kit the sound was not good. There was a significant difference. Now the sound completely lacked fullness. What...

If using the same source (such as Tidal) is there any noticeable quality between using Oppo via an iDevice, android or pc? Which one sounds best?