Plex has a broader range of supported devices, a slightly better user interface, and provides a path to sharing your library using logins for friends and family, with https so the traffic is encrypted. You can share your movie collection with Grandma without her getting FBI piracy warnings from her ISP.

I don’t use it because it costs money and it is a very simple vector to get in a lot of legal trouble, should any US government agencies put enough pressure on them to gain access to user data, because your streams pass through Plex’s servers to make the connection.

So far though, it has been safe and reliable for the majority of its users.