I've used that Kingdel fanless pc for years. I'm running Windows 10 and Fooobar for the local files with the free version of Fidelizer. Because it's Windows based I can run Amazon HD using the Windows app for my streaming service. This computer runs 24 7 and has never given me a problem. To control it I use the built in Windows RemotePC app and can access it with my laptop, phone or tablet. I do not use a linear power supply but I do block the 5 volt usb signal from the computer and use a powered usb hub to connect to my DAC. The sound is really good and the system is very stable.
On the same stereo I also have the PI2AES using a switching powesupply and Volumio software. In a direct comparison the PI2AES sounds slightly better in a side by side comparison, I think. I haven't done the double blind test but could definitely say if I walked into the room I couldn't identity which source was playing. Volumio has two major issues in my system. It is very unstable and crashes daily and there is no way to play back Amazon music in HD. I've used Volumio for years and it was never this bad. The latest is they've rewritten the software and unless you start over and flash the latest image they will no longer be able provide upgrades in the future. I haven't used other PI based software. LMS and Moode are what I've looked at and I'm sure with time I could figure it out but I'm a little confused about how exactly to move forward with either one.
If anyone has experience improving the PC sound I would be grateful for input