Audio Aero Capitol or Cary 303.300?

I am very interested in helping a friend who is looking to nail the question. He's heard a few comparisons and thinks that the systems were contributory to the very near results.
I am wondering of those who have heard each. Or better, owned one and the
other. And what about the Jolita 100a, not in the same league, or a hidden
gem?
Lastly to put a fine point on it, the digital output is very important, as he wishes to run a d/a. He didn't get to examine that in the auditions.
Secondarily, Cary says that the CDP is the same as the 303.300 from disc
to digital out. Anyone have experience comparing the Cary CDP to 303.300?
Have any compared it's digital out with say a Krell 280CD? (that would
be my focus, beyond his)
He liked the 303.300 over the Audio Aero ?Prima? the Prestigue is out of
his price range as he's trying to go "clean second hand" if he can;
discounted retail if he must (and believes he will in the long run for
waranty.).
Thanks for as much as you can give on this.