I prefer regular Blu-ray over 4K UHD, and it’s not even close

On a technical level, 4K UHD Blu-ray discs outclass their 1080p predecessors on all fronts. 4K UHD discs can store significantly more data per unit, movies and TV shows distributed on the format are of much higher resolution, and, oftentimes, the most advanced spatial audio and high dynamic range (HDR) technologies are exclusive to it.