I haven’t tried single ended.
SE will probably sound better, because I don’t believe Holo use "dual" discrete banks of R2R resistors per channel to get true balanced.
I think they are single bank of R2R resistors per channel for the SE output, then probably a SE to balanced opamp to get pseudo balanced output.
So far the only one I know that uses dual R2R banks for true balanced out put is MSB flagship models and Soekris top models
Soekris models
True balanced dual R2R resistor banks per chanel https://ibb.co/bFCR0pY
Single Ended R2R resistor banks per chanel https://ibb.co/LQQ0dBJ
Cheers George