Advantages of keeping the DAC•iT X
I'm very happy with the sound, for the most part
Around $200 cheaper
Being silver, I guess it matches my Woo WA3 better. That might matter to my girlfriend. Not much to me.
Advantages of switching to the Resonessence Concero
While I'm happy with the performance of the DAC•iT X, I don't know if it's "perfect"... For instance, while I am aware there are many vastly more expensive and technically superior amps to my WA3, I've listened to quite a few of them, and while they were great, I didn't feel they were that much better than the WA3... In many cases, I liked them less. Particularly with the tube selection I have dialed in. For me, it's basically perfect, and if I had a million dollars to spend on audio tomorrow, I don't know that I'd get rid of it... Probably just buy a bunch of NOS W.E. 421As, and other rare tubes, ha ha. While the DAC•iT X is great... Is it perfect for me? I'm not sure. I'm very open to the idea of liking something else better. I just haven't found anything. Yet.
I really like the idea of ditching a power cable by having a DAC that runs of USB power, and the Concero has shown in tests the USB power doesn't add noise to it's design.
It might sound better. Certainly the people who've reviewed it seem to think so.
Being tiny and USB-powered, it can go with me when I travel.
Reading the above, I almost feel like I've answered my own question. But if anyone else has any advantages for either camp that I haven't thought of, I'd love to see them. Also I'd love to read something from someone who's listened to both...