Its such a good client. With the YT Roku app, if you change playback speed, quality will drop to 720p or lower. SmartTube lets me watch at full 1080p with 1.5x speed.
Ubuntu with a custom DE that has pre-set options to look like Windows or MacOS, so that people moving to Linux from another OS find themselves at home. The custom DE is based on Gnome according to the Wikipedia page[1].
No ads is of course a big plus too.