Billy Drago

Though note its different color grading from the IP-sourced but poorly compressed Fun City Editions US Blu-ray (caps)

Judging from spectrograms at https://forum.blu-ray.com/showpost.php?p=23933756&postcount=57, Fun City Editions US Blu-ray appears to have marginally less filtering than Radiance 4K Blu-ray (whose padded 16-bit depth is a non-issue). There are also loudness differences, though it's unclear whether dynamic range also differs. Caveat: need to A/B both tracks to confirm, but no one has posted actual A/B impressions.

Dolby Stereo mix

According to one source: "Best audio is the original dolby stereo that is included on the UHD Blu-ray. It sounds miles better than anything released on DVD, Blu-ray (they sound much more muffled), and when compared to the atmos...However, it's not without its faults, as WB had to spoil and boost it causing clipping, still it's the best audio available for the time being."