The CD player offers the highest quality signal in our stock system. USB/MP3 is ok for background noise. Music enjoyment.....CD Player. Bump and Thump fans are happy with MP3, I am not. So we have an all purpose system!
Sometimes having an actual better sound outweighs the 'shame' and ridicule cast upon those still using so called "out-dated technology", and the supposed 'convenience' of the newer tech.