Why would you presume so? Do you have the same prejudice against CD output via S/PDIF, assuming that the D/A is equally good in player and processor?
Kal, yes - if the DAC and analog output stage are of equal quality I would be biased against a transport with outboard DAC over S/PDIF and get the integrated player. The reason being that sending bits over a cable using an S/PDIF interface will have more degradation than sending the same bits over the data bus internal to a player. The only reason to get an outboard DAC is if its BETTER than the onboard DAC.
However, that is somewhat besides the point and not the reason why I think the MCH 4 x coax digital moddel player is not likely to be better than a very good analog player applying A/D conversion.
Yes, if a MCH digital transport was build to the same standards an ud9004 (say an EMM labs transport with unencryted LPCM AES/EBU outputs) it would undoubtedly be better than analog out of an ud9004 with A/D conversion. However, the player offering this (illegal!) feature is essentially a garage operation modded $500 Oppo. Then you need to do S/PDIF to AES/EBU conversions to use it with the trinnov pro unit. By the time these bits arrive at the trinnov it is not unlikely they are very jittery and not any better than an A/D conversion of a very high grade analog signal.
Second, - and I know you disagree on this - for SACD the modded Oppo digital transport would need an DSD to PCM conversion, whereas the ud9004 will do source direct (no conversion). In my experience source direct always beats converted to PCM.
What will sound best is all pure speculation and can only be established empircally, but my assumptions are not entirely unreasonable IMO.