Thanks for your replies!
@lordmelton , I'm not referring to dual mono. The Single Ended RCA DAC I'm considering is the MHDT Pagoda ( http://www.mhdtlab.com/Pagoda.htm ) and the dual differential XLR DAC is its brother MHDT Balanced Pagoda ( http://www.mhdtlab.com/Pagoda%20balanced.htm ).
The Balanced Pagoda simply has 2x PCM1704 DAC's per channel in order to obtain the negative and positive portions of the XLR signal while the unbalanced Pagoda simply has 1x PCM1704 per channel for just the positive signal.
Now that I'm playing with an open hand...do you think the Balanced Pagoda to be superior to the Pagoda? Or the dual DAC for the negative and positive portions of the XLR signal could decrease signal accuracy? I think about tolerances that make a chip never identical to another leading to a slightly "smeared" signal.
It's the old story of single ended RCA considered simpler and someway better than XLR by someone while others say exactly the opposite.
Eventually, I own an RCA Pagoda, should I take a Balanced Pagoda with no chance to test it before buying?
Thank you for your help!
Gianluca