VLC is pretty great with handling any video files you throw at it, but there are times that you need to step in, as with subtitles.
But beyond all that, what makes VLC great is that it's lightweight and easy to use. VLC is also available on the Apple Watch. Moreover, VLC has apps for a variety of platforms and devices, including Windows, Mac, iOS, Apple TV, Android, Android TV, Xbox One, and Chrome OS among others. It's open source and available free of cost. With over 3 billion downloads since launch, VLC is quite likely the most popular media player.