My initial experiments a few years back between different DAPs connected via 2 inch coax cable to Hugo 1 and then TT1, were a slight perceptible difference. Since then I’ve collected more DAPs, connected via USB, Coax and Optical, and any differences were not clearly one better than the other. Connected to my Tag McClaren hifi however, coax sounded more precise than Optical, but that may be due to the Tag inputs.
Have you any native DSD512 music? I have unconverted via PC, for testing on my special edition iBasso DX200Ti DAP. The standard iBasso DX200 is one of a very few DAPs available capable of DSD512 playback, and there is a dedicated thread here on Head-Fi of DSD512 playback. Only 1 minute at a time with demo software! It sounds different, more holographic, but is it better? Possibly, as the DAP is working less on playback. But file sizes are enormous, and that is where Streamers score over DAPs, which usually have max 128 or 256GB internal memory and MicroSD cards that have only just reached 1TB.