I was astonished, actually; I had assumed Windows would be better than macOS as a TV computer, other than integration with Apple services (Apple Music, my kids photos as screensaver).
Nothing could be further from the truth. It's a shitshow. 100% of Windows media players are garbage (VLC included, and there is no Movist). They can't play high-bitrate video without stuttering (on way better hardware), they show some ungodly mishmash of scaled UI and tiny unreadable UI on a 4K TV, for each player you install (about 10, so far, for me) you have to google for an hour to make sure they aren't malware (and of course almost all of them nominally are, trying to install all sorts of insane adware shit during the install phase, although that is par for the course on Windows)...
It's been 2 months and I saw the new Mac Mini and despite the 200%+ markup on storage I couldn't help but think Hmmm....
My TV also has at its disposal Xbox (OK but not great), PS4 (pretty shit), iOS (Apple TV, pretty shit), and Nintendo Switch (has no TV computer features at all, basically).
So what OSes are you talking about? Linux?? Android?