At the risk of stating the obvious, any listener with Bryston gear can decide him- or herself.
Spend a day or two, or longer, listening with all single-ended connections—player/DAC > preamp >power amp—and then with all balanced. And then back again.
As regards the whole business of what balanced is, and how it may benefit audio playback, etc., I read a very helpful discussion on the Benchmark website.
And as has already been mentioned, part of the advantage, the Benchmark engineer points out, is the higher voltage; in effect, a better S/N ratio. It's a technical discussion but not at all hard to follow if you take it slow. . .