My attempts with XLR: if you don’t have an interference problem, don’t waste your time or money. I ran 25 ft RCA’s and 25 ft XLR, zero difference, because I didn’t have any interference to start with, and the RCA’s didn’t get noisy either.
A stage, multitude of wires, sensitive mic cables, XLR for sure!
I did find two slight advantages using XLR from my Sony xa5400 SACD/CD player
1. XLR is a secure connection, so mess with other cables, they will not be disturbed like RCA connectors occasionally are.
2. Slight Volume Increase. No ’better’ or ’preferred’ or ’different' sound, but a discernable volume increase, IF that makes a difference. btw, other equipment, no volume difference, so it’s the Sony xa5400’s output that is slightly stronger, not the cable.