As @bigkidz said the DAC will have a big influence but don’t forget the W20SE has a 10MHz master clock connection. This makes a big difference.
Also consider comparing files on the Aurender’s HDD to the CD player because streaming opens another can of worms, plus as you stated previously you need the W20SE for DSD and Hi-Rez files.
For those who asked about SACD ripping:
https://www.psaudio.com/copper/article/down-the-rabbit-hole-of-sacd-ripping-and-dsd-extraction/