If you are looking for a dedicated media box for your living room or bedroom, the first thing you should consider is Kodi. This is a media center software package that delivers a very focused consumption experience. It can even be customized with "addons," although some of them can be used for piracy -- something we do not condone.
Unfortunately, Kodi is not its own operating system, meaning it has to be run on top of an OS. Sure, you could use Windows 10, but that is overkill if you only want to run Kodi. Instead, a lightweight Linux distribution that only serves to run the media center is preferable. One of the most popular such distros is OpenELEC. It can run on traditional PC hardware, but also Raspberry Pi, and, my favorite -- WeTek boxes. Today, version 8.0.4 achieves stable release. It is a fairly ho-hum update, focusing mostly on fixes and stability.