Balanced or RCA?

You may want to contact both manufacturers, some manufacturers specifically design their gear for one or the other (yet offering both), therefore giving a greater result. I have asked several manufacturers this question and they have always told me what would give the best results.

In lieu of some responses, I would like to elaborate further on what I had stated; some manufacturers design their gear in manner whereby it will benefit one over the other, although they offer both RCA and XLR; therefore it isn't that the cable (type) is better but rather it is a better match for the design.

One person above mentioned Meridian, due to their design, they will tell you that XLR should give you best results with their gear.