If I understand audiomirror's post above correctly the balanced output passes through a transformer (same with my ANK DAC by the way). I am a minimalist and would prefer less components in my signal path. But this would be gear/system dependent. You should try both if you can and decide what you like.
My ANK DAC sounds a little better with RCA interconnects, but that might be because my line stage is not fully balanced. I have a balanced input, which passes through a transformer inside the line stage. So what I might be hearing is the side effect of the transformer in my line stage.
In any case, I thought I would suggest to try the RCA output as well. If you prefer the balanced output, obviously there is no point to replace the stock RCAs.
My ANK DAC sounds a little better with RCA interconnects, but that might be because my line stage is not fully balanced. I have a balanced input, which passes through a transformer inside the line stage. So what I might be hearing is the side effect of the transformer in my line stage.
In any case, I thought I would suggest to try the RCA output as well. If you prefer the balanced output, obviously there is no point to replace the stock RCAs.