Accustic Arts Tube Dac II or Berkley Alpha DAC

In my system Berkeley sound far far better than AA.
Like night and day!
May be tubes was not good in AA.
But it is a fact!
My friend, who bring AA said that it is best DAC he ever heard. But after comparision he bought Berkely!

We used Mac+Weiss as transport and tested redbook only.
I understand that in another systems results may vary.