I’d encourage you to try optical for the source you think you’ll listen to the most. Zero electrical noise is a big win and the DirectStream is incredibly good at eliminating the kind of jitter that Toslink is known for.
If you’ve got a proper balanced, differential XLR cable then AES/EBU would also be a good option. It will electrically link your DAC and your transporter but at least it won’t pick up radiated intereference on the path between the two.
Transporter I would go AES with a decent 110 ohm cable like a Mogami.
I haven’t had good results with optical, though some swear by it, including the guy who modded my Mini (same guy that did Paul’s). I got one of the real glass (not plastic) cables he suggested. But it still sounds to me like it’s connecting two ten-cent converters. Very “clean and crystal clear” but tilted to the top end to my ears.