AES/EBU vs SPDIF and AES/EBU to SPDIF adaptor

Jim, thank you for your response. I should have worded my question better 

as I think my point wasn’t clear. Basically is there a difference in the digital

domain, using an AES output on a source component via a AES to SPIDF adapter

vs a AES to AES Cable. Provided the DAC has a AES input or buy a DAC with 

SPDIF input only and use the adapter. 

My reason is, I can’t afford a DAC that AES input and features like remote, built

in headphone amp etc.

In my long experience of connections I have always found AES to be better than single ended and especially when adaptors are used as as that is another thing in the circuit and it always adds it's own signature. Also AES is usually devoid of hum, can't say that about single ended.