Most of the 4K streaming isn’t much better, and some times terrible, than regular HD video in quality, and on audio, but if your equipment, and sense organs are okay with that, streaming becomes extremely easy.
Those who want top quality will buy the 4K disc because they might want clear video display for themselves. But for those who cannot afford it, they should go for Bluray since they both have similar features. Although it has outstanding attributes, the deal breaker is the price that is a bit higher than regular DVDs.
UltraHD do not necessarily replace Bluray they simply are a higher resolution form of Blu-ray, so regular Blu-ray discs will playback just fine on a 4k UltraHD player. But, there are some movies that have scenery so spectacular that the environment and scenery are another important ‘character’ to the story.
The UltraHD is in fact a Bluray that clasp 4k film rather than the normal ones. For some people, pictures and volume quality is not necessary to them they care more about the model of the product. None of the two are manufactured to be better than the other. They have they individual importance that varies from each other. The more technology advances, that is how most companies would change their pattern of production and improve the quality of their product for better sales. Aside buying the 4K HD DVDs, you need a good TV for better experience. There are still some users who prefer Blu-ray to any other type of DVD so it all depends on individual interest.