I've never touched the balanced XLR outputs. I know the single ended RCA's are just a direct lead from Rob's pulse array output (well via a hi/low gain relay). My understanding is balanced just takes this to an amplifier stage to create a negative going signal. So you have ~twice the power but with the distortion from the balanced output amp.
In the interest of transparency, I just want to be right on the outputs of the pulse array. I had Analysis-Plus (USA) build me a RCA->dual-banana version of their Silver-Oval-2 speaker wire. No upcharge.
BTW - I am unclear what difference (if any) is had by using interconnect cable topology vs speaker wire topology. I'm sure at the low-ish volts/amps of the TT2 output, it won't matter ...so go with what is less $.