OP,
You are right to ask the question. But one can simply sound better because of the way it was designed and built, and the component you are connecting it to. Whether the design is fully balanced is unlikely to guarantee the correct choice. The correct answer is you have to try them both to be 100% sure.
I own ARC equipment which is balanced, and they recommend XLR… but I tried both and if there is a difference I can’t tell. They spent a lot of effort to make sure they sounded the same. With my equipment I am able to hook up to equalize the volume and switch back and forth.