My system has the dCS Verdi SACD transport which will play both, however the red book is up-sampled to DSD thru the Purcell. I tend to agree with Ghostider45, the best way -or one way- is to compare the three recording of Jacintha. Because "Here's to Ben" is XRCD2, “Autumn Leaves” is Gold CD, and finally "Lush Life" is on SACD (or at least this is how have them). Normally all of her recordings are excellent. Well guess what? I still like the SACD better. So again, if the SACD is properly recorded, it will sound better than any other red book CD, whether it was XRCD, XRCD2, Gold, or Aluminium. This is just what I think.
Hope the above helps
Hope the above helps