The NW-WM1z has a copper chassis so this adds a little more validity to chassis materials. However, Sony goes further and upgrades wires and caps whereas AK uses the same PCB for all their chassis.
Sound quality aside, I decided to stay with AK instead of Sony because of the following:
- Sony UI is not as refined and mature as AK. I know they will get there, but I don't have the patience to wait.
- New 4.4mm balanced port - while this is a superior connector, all of my cables are terminated for 2.5mm AK.
- Sony does not have wifi, so no streaming, no DLNA capability.
- Sony does not have a DAC mode
- Sony uses a proprietary cable for charging and data xfer. I have too many cables as it is.
I'm sure the sound quality is top notch and the Sony is certainly a better priced TOTL DAP.