I have a very slow Internet connection (5 Mbps down, and even less for upload). Given that, I always download movies at 720p, since they have low file size, which means I can download them more quickly. Also, I don't notice much of a difference between 1080p and 720p. As for 4K, because I don't have a screen that can display 4K, I consider it to be one of the biggest disk space wasters.
Am I the only one who has this opinion?
I usually watch youtube (well via Freetube) on 480, maybe 720 when I am paying attention and 360 when I am laying down. I prefer these small file sizes because I can skip left and right in the video time with the arrow buttons like the file is local and not online. I haven't pirated a movie in years (I would not want to watch anything new) but I download a lot of old racing from the 80s and 90s and it is already 480p, so as long as it is in english, not black/white I am happy.