For me, the biggest selling point with Plex was that it was so readily available on TVs and other devices. I can basically throw it at almost anything. I also occasionally share access to my Plex with friends, so that ease of use carries over to them too. It’s great at getting subtitles I might be missing too, which is a big deal (my wife and I have subtitles enabled for basically everything).

tl;dr - easy onboarding for everyone and broad compatibility.