There are lots of great DACs that use both. A number of very good vintage DACs from Spectral, Sonic Frontiers/Assemblage, Classe, Krell, and Parasound use PMD100. On the other hand, fantastic vintage DACs from Linn, Monarchy, and the Sonic Frontiers TransDAC all use DF1700P.
I'm not sure I could say that one is any better than the other. I think this is one of the reasons that people pick by input/output when buying Adcoms instead of the specific chips, etc. Probably not the most helpful answer I can give, but certainly the most honest.
No, actually, that was very helpful, thanks!
Oh right, I do recall reading that. It went in one ear and out the other, though, since it's not a feature I'd use. Thanks!
Or maybe a used HA-1?