Sound. The Amazon Fire TV Stick 4K and Apple TV 4K both feature Dolby Atmos sound. That the Amazon Fire TV Stick even offers Dolby Atmos at this price is a huge plus, and the fact that it actually sounds rather good is a real treat. This is room-filling sound with real weight and drama, and excellent placement of effects. Compared to how HDR video is captured, 4K is elementary. 4K video simply refers to footage captured and played back in a resolution with a horizontal measurement of around 4,000 pixels. Most 4K cameras use the same technology as non-4K variants. However, 4K cameras typically require a camera and SD card with a higher write speed. With a pixel count of 3,840 x 2,160, the term '4K' emphasizes the fact that UHD has four times the number of pixels than a standard 1080p Full HD TV. Pixels are colored dots that make up the images we see on screen. The higher the pixel count, the better the clarity and crispness of the images and hence the resolution. HDR Vs. Availability and content As 4k TVs are the norm, native 4k content is also easy to find on most streaming apps like Netflix, Disney+, and Amazon Prime Video. Physical video sources, like Blu-ray players and gaming consoles, are starting to support a 4k resolution as well, but they were limited to 1080p for a long time. No. Both are Ultra High Definition - UHD (3840x2160) in resolution. The one labelled HDR has High Dynamic Range (more colors) for TVs that are HDR capable. HDR has nothing to do with pixel resolution. Neither are in fact actually really 4k, as I stated before, it is merely a marketing term being used improperly. 4K delivers a sharper, more defined image. 4K UHD requires a strong GPU, CPU, display, and more. HDR refers to high contrast between lightest & darkest. HDR invovles color grading to better display images. HDR makes the colors more saturated and life-like. HDR needs HDR-friendly components from source to output device. It depends on the use. 4K is better for all-purpose use as everything will be more clear and sharp. General desktop use, browsing the web, etc. Its "on" all the time. Good HDR is better for gaming and movies, but useless for everything else. Also not every game/video supports HDR. Dolby Vision vs. 4K is a one-sided debate in the home theater world. Any content with Dolby Vision is a significant improvement in depth and color accuracy over 4K. The 68.7 billion color palette is something you need to see to believe and is a definite upgrade over HDR, which is 10-bit at around a billion colors. The TCL 4-Series was able to produce 99.55 percent of the standard full color gamut, for example, while the Vizio V-Series reproduced just 97.6 percent of the color gamut. That difference meant The typical qHD resolution is 960 x 540 pixels or 540p. QHD, on the other hand, is four times the standard HD resolution. Keep in mind, four times the HD resolution, not Full HD. The typical QHD resolution is 2,560 x 1,440 pixels or 1440p. That's four times as many pixels as 1280 x 720 or 720p. yMuy.