Bit rate and video codec are more important. You tube and Netflix 1080p are far behind Blu-ray 1080p. 4K streaming is not much better, if better at all, than 1080p Blu-ray when it comes to scenes with plenty movement. Blu-ray has video rates up to 38 mbps for busy scenes, while 4K HDR streaming tops out at 18mbps (sound included) The 4K codecs are close to twice as efficient as Blu-ray's, still not enough to make up the difference and display 4x the color detail (10 bit vs 8 bit) and 4x the pixels, 5 times the information rate. DVD looks better than 720p You tube.
For games, down sampling a game from 4K to 720p, or playing 1080p on a 720p tv will look very good. Up scaling 720p to 1080p not so good. Anti aliasing is always a problem in games, up scaling makes all the flaws more noticeable. Movies don't have that problem. Of course it also depends on how well the display handles up scaling.
HD Cable tv is the worst, 5 to 8 mbps mpeg-2 720p/1080i. Outdated codec, low bit rate (still higher than you tube) and looks horrible in fast moving scenes or with lots of particles (like heavy rain, confetti raining down, strobe lights). But it's still called HD, even though analog cable (while it was still available) delivered a more stable better looking picture when it came to movement. HD is only HD in steady cam low movement scenes...
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