If you have a 4K TV (especially one with Dolby Vision) and a capable player (like an Nvidia Shield, Apple TV, or OLED TV with USB playback), this is the gold standard.
Pros:
The result: On a native 2160p display, the difference is subtle but profound. The fine fur textures of the Viperwolves, the individual fibers in Neytiri’s costume, and the distant bioluminescent spores achieve a level of crispness without the "edge enhancement" artifacts of the old 1080p release. The UHD BD (Ultra HD Blu-ray) disc also boasts a significantly higher bitrate (60-90 Mbps) than any streaming service (15-25 Mbps), eliminating banding in the deep blues of the Pandoran sky. Avatar -2009- EXTENDED -2160p- UHD -BD- DV HDR ...
release, which is the definitive version containing the extended cut. Avatar Wiki Film Versions Included The Verdict: The Definitive Way to Watch at
The World of Pandora
The Avatar (2009) Collector’s Edition 4K UHD Blu-ray represents the definitive home media release for James Cameron’s sci-fi epic, offering a significant technical leap for enthusiasts of physical media. This release is characterized by its inclusion of Dolby Vision HDR and three distinct versions of the film on a high-capacity 100GB (BD-100) disc. The Three Versions of Pandora PC monitors without HDR (washed out colors) Older
The Visionary Director: James Cameron