Optimal length(s) of a digital aes/bsu cable

I have an option of a high end cable (0.6m) as a digital interconnect between a Berkeley USB and Reference DAC. I’d rather have a short cable practically speaking as the boxes sit next the one another but I also want to maximize sound quality (of course.)
i have read in agon that I should go with less than 1ft or >1.5m. That was with spdif but what about aes/bsu? Does that have a different dynamic, being balanced and all?
Thanks!