Amazon Fire TV Stick 4K vs Apple TV 4K: which is better?

[What Hi-Fi?]

A huge price difference, but these two video streamers are closer than you might imagine.

Amazon Fire TV Stick 4K vs Apple TV 4K: which is better? : Read more

 

[Audiot]

I don't understand, how can Apple TV offer better sound than Amazon FireTV 4k stick? Isn't it all just digital data passthrough via ARC return channel over HDMI? There is no DAC in play, audio data is just streamed from the internet and passed through the HDMI channel.