Container makes it easy to update. I don't need to go read the instructions about which files I need to replace or what to do about modified files. If it's built properly to run from a container and uses sane version numbering, all I need to do is pull the new image and restart the container.

There are still plenty of not sane container builds that don't make it easy. If I need to checkout a git repo and mount a path into the container it's not sane. Pulling an image and starting a docker-compose should be all that's needed.