Squeezbox Touch USB or SPDIF?

What output is the best to external DAC from Squeezbox Touch?
Grannyring, happy to know this worked out for you!
Marakanetz, In in Grannyring's case, he has a DAC/integrated with only USB input. An USB is a great option to have, but I do not know which will ultimately sound better. Like Kal said, try it out and hear which sounds better in your system.
To use the soundcheck mods to output USB from the touch, you'll need a USB DAC that does not require software to be installed on the source computer. This will work with a Benchmark DAC, e.g., but not with my Wyred4Sound.