It looks like opinions vary here, I prefer 9.0.1 to the much loved 7.1.3. I did switch back to try 7.1.3 a while back, soon reverted back, for me 9.0.1 is the more 'analogue' sounding version.
1000 Pro - KEF Blade - iFi Zen Stream - Mutec REF10 - MC3+USB - Pro-Ject Signature 12