Yes I think the BDP still has the upper hand when it comes digital playback over all in one computers.
I prefer USB and use it at all the shows - AES is a close second and sometimes I get confused when doing A/B's between the 2.
I understand the differences between the electrical constructions and power considerations, however, if the BDA-3 already re-clocks all signal and ignores the usb power (if i understand this correctly), how exactly is the BDP (or any other high quality player) superior to a computer? Could you please elaborate a bit on this?
As a side note: I use a headless (only Roon installed) Mac Mini as a player. When I connect my projector to the Mac Mini which is connected via USB to the BDA-3, there is a lot of very audible noise from coming from the BDA. So I guess noise from improperly shielded or built devices can get through - my question above is aside from these things or the playback software, convenience aspect, etc...