Skipper320 hi, I believe you want to know is there an advantage using balanced (xlr) over single ended (rca)?
The short answer is NO, if the interconnects are around 5mt or under, and not passing next to any heavy noise noise generating equipment EG: a switchmode transformer.
The only time (xlr) can have an advantage over rca is "noise" if the interconnects are >10mt long
Even then, sadly many poweramps and preamps I've seen, use an opamp to create a balanced inputs or outputs, only to be really a single ended in design, these definitely sound better via their single ended inputs or outputs because all you are hearing via the balanced, is an opamp in the single path before the discrete rca circuit.
And I've seen this on some high end equipment!!!!!!
Cheers George