For about the last week and a half I have been using Emby almost exclusively. The change has nothing directly to do with the Roku interface or the server or reliability but rather it has to do with speed (loading of the app and startup of videos) and missing info in the Roku app when viewing TV shows.
The TV info that is missing is best described by simply saying that SxxEyy is all that is shown as far as details of each episode when browsing the “OnDeck” list, I like to know the NAME of the episode I am about to play. Emby shows the episode name as well as SxxEyy and I like that a LOT better than the lack of info Plex shows.
The speed issue is across the board. Everything is faster in Emby from the initial startup of the server, to the startup of the app on Roku (This is true for all the Roku apps Plex has) and the start of any video. In Plex it is from 7 to 15 seconds or even as much as 30+ seconds from the time play is pressed to when the video actually starts playing. The average is closer to the 30 seconds than to any of the lower numbers. Emby, except for a rare glitch, only takes a maximum of 8 or so seconds to start playing and usually it is faster than 4 seconds. It should be noted that Plex is actually running on the faster computer and that storage is on network shares that both have equal access to.
I like the interface in Plex a little bit better than Emby’s, particularly when browsing my movies libraries, but it is not near enough better to overcome the sluggishness and lack of episode names when browsing.
I just installed in Emby the “Roku thumbnails” plugin and it runs a lot and the speed tests that have showed Emby better are in spite of that plugin running.
I still have both Plex and Emby running but the only thing I use Plex for is audiobooks playing on my backup server on my Shield TV because Plex (on the Roku) will play videos with no video part while Emby does not, at least yet, have that ability in any client. Being able to play those files gives me full reliable audiobook support so I keep Plex running on my Shield and dedicate one Roku to audiobooks and have it hooked to my whole house audio system. (NOTE: I use Alexa’s skill “QuickRemote” to control my Roku for audiobooks.)
I am keeping Plex running (on a computer) because Plex may fix their slowness and/or Emby may do something stupid and I like the idea of easily being able to switch systems if needed.
The real difference between Emby and Plex is small but Emby is better for my use at this time.