Re: Plex native vs in Docker: Plex says they don't support hardware transcoding inside a Docker container. This is kind of important to those of us trying to use lower-powered CPU's that support it. I do know my way around Linux enough to load the Plex .deb natively, but others may not.
"Can I use Hardware-Accelerated Streaming inside of Docker?
At this time, we do not formally support hardware acceleration inside of a Docker container. Some users of Docker (on Linux only) have been able to accomplish this by adding platform-specific custom configurations that expose host hardware to the container."