I run a lot of actual balanced, dual differential designs and I feel that despite there being extra cost in having separate left and right channels, this duplication does bring sonic benefits. Having an xlr out or input does not mean its actually a balanced design.

If the products have both rca and xlr outs and ins and are not true balanced designs, there might be a small improvement over rca if where you live is a noisy place re rfi and interference, but if not rca, single ended might sound as good, or better, depending on how the xlr connections have been implemented.