Why is that? I have a thinkpad x220 laptop (foobar2000) to zuperdac, and my Samsung S5 (uapp) to zuperdac. They both sound fantastic and essentially the same (although I admit to not having gokden ears).
Yes, that could be it. Or possibly we simply hear things differently. I'm using the Zuperdac, and to me the Monks sound great off of it. From what I've read so far, the Dragonfly Black is very good, but maybe it wouldn't be for me if it affects the Monk+'s negatively. Fwiw, I'm still waiting to find direct comparisons between the zuperdac and DFB.