Yes, it varies and depends on many things. That is why the statement: "There isn't a difference between rca and xlrs" is wrong in my opinion. Seems like you agree.
Of course sometimes there may actually be little or no difference, sometimes rca's are better, but every time I have compared the two in my setups XLR has come out ahead.
Edited by Hooster - 12/8/12 at 11:46am