The best discrete devices sound better. They don't require massive amounts of corrective feedback in order to achieve linearity resulting in better transparency and focus. Lumped sum distortion measurements using uncorrelated sine waves provide information - but no useful knowledge as to how audio gear sounds playing music. I recently upgraded my garage system's DAC using discrete FET replacements for the OPA2134s used with it. Such is easy to do with socket mounted op amps. They just don't.