Caveat - I am older (48), and I am sure I have some hearing loss.
First off, interestingly the Audeze Mobius sounds brighter than the iSine 20s and BT Cipher. Maybe
@KMann can weigh in on the tuning difference between the two DSPs.
The sound between the Cipher connecting via aptX HD and 4.4mm balanced out on the NW-ZX300 seems to depend heavily on the song. On some tracks, the wired option seems to be brighter and the depth a little more pronounced. On others, it's reversed. Comparing these to other IEMs as I listened to track after track (just for you!) reminds me why I love these things - rich sound, incredible bass.
That leads to another question for
@Audeze - it seems (based on my memory of physics and sound from 30 years ago) that the attack on the Cipher BT might be what causes some songs to sound more detailed - faster attack makes things pop a little more. Of course, I might just be crazy.
Bottom line - both are good. Some reviewers have said the BT Cipher makes music sound muddy, and I disagree. The convenience versus any appreciable sound quality loss will have to be heavily weighed.
Addendum: One thing I have found is that at very very low volumes, the BT Cipher loses depth faster than the wired connection. That may be a factor if you like your music at whisper, 20 decibel levels. I did listen to quiet classical music as part of my comparison, and quiet tracks are not a factor. Listening to some Mumford and Sons right now - Babel - and this is an example of an album where wired may have more depth. A DSD of Violin Concertos sounded better on the Cipher.
EQ applied:
Peaking 31 Hz 1.41 2.5 dB
Peaking 62 Hz 1.41 1.8 dB
Peaking 125 Hz 1.41 -0.6 dB
Peaking 250 Hz 1.41 -1.7 dB
Peaking 500 Hz 1.41 -0.4 dB
Peaking 1000 Hz 1.41 -7.9 dB
Peaking 2000 Hz 1.41 1.1 dB
Peaking 4000 Hz 1.41 8.9 dB
Peaking 8000 Hz 1.41 -2.2 dB
Peaking 16000 Hz 1.41 -2.5 dB