Small portable DAPs compared: Hiby R3 ii, M300, Sony NW-A55, NW-A306

Comparing the Hiby R3 ii, Hiby/Hiby Digital M300, Sony NW-A55, Sony NW-A306 (uncapped volume).

A correction to the video regarding the "sweet spot" volume for the Fiio JD7 on the Hiby M300, it is 35 and not 45. The 45 applies only to the IE60

Correct release order is:
Sony A55
Sony A306
Hiby R3 ii
Hiby M300

Mod on my Sony NW-A55 is Midnight v2 (for A50) - Plus v2 mode Firmware mod by MrWalkman

Covered in the video (in no particular order):
My favourite of the 4
Best value of the 4
Price comparison
Screens
One handed use, comfort, ergonomics
They all sound pretty much the same
Claims of alleged audible differences need to be verified via a blind A/B test
Noise floor/hiss
Ability to drive my IEMs (FH3, JD7, IE600), Headphone (DT 700 Pro)
Most powerful to least powerful (volume)
Volume required to drive the Fiio JD7 to its sweet spot on each DAP
Software/UI/user experience/speed/fluidity
Battery life
Optimising the system for battery life
All 4 sound good
All 4 would constitute a good buy
I do not use Bluetooth

The Hiby M300 has systemwide upsampling. There is no bit perfect on any app, be that the native Hiby Music or a third party app.