BAT stuff and Cables

4yanx,
Balanced circuit tends to be less-depended on wire quality length and reactance i.e. gives you less options to "play with wires" and/or "audition" them. It's more versatile in all cases whether you're using long or short runs lowers noise floor and increases gain by few dB.

Added unbalanced connectors on newer BAT fully-balanced equipment can only add an extra noise especially if unbalanced cable is used.

If you buy directly from BAT, you can realy request the "old way" with only balanced inputs/outs as well.

Few more to add to the balanced circuit:
It is certainly more complexed so the manufacturers made pople believe that SE may sound much better.