Sounds like you ran across one of those people who think Single Ended is the only way to do audio. I am in total agreement with the fact that this guy is wrong -- how can RCA image better when XLR typically has 3-6 dB lower noise floor as compared to RCA???
RCA vs XLR
I was told by a dealer that RCA connections will tend to sound more 3 dimensional that XLR. Currently I am running everything balanced. Does anyone have an opinion and have you experimented with both formats?