Krell K-300i, RCA vs XLR

Reaching out to owners of the new Krell k-300i. Has anyone been able to do a fair comparison of the RCA vs XLR connections? The integrated is describes as having "fully differential circuitry that runs from the input stage through to the last output gain stage". That would suggest that an XLR connection is superior, but I would like to know if any real-world tests have verified better sonics through balanced cables