When comparing Plex vs Kodi, the Slant community recommends Kodi for most people. In the question“What are the best media center programs?” Kodi is ranked 1st while Plex is ranked 4th. The most important reason people chose Kodi is:
Android, Mac, Windows, Linux, iOS, Xbox, Apple TV (jailbroken), and more.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Supported on many devices
It's pretty hard to find a NAS or STB that doesn't support Plex.
Pro Accessible via web browser
A modern web browser is enough to get everything Plex has to offer.
Pro Added lots of media databases
Metadata for media files will automatically be updated by using media databases. This provides posters, movie trailers, descriptions, information about actors, etc.
Pro Can install on several devices
Android, Mac, Windows, Linux, iOS, Xbox, Apple TV (jailbroken), and more.
Pro Lots of plugins available
Like PlutoTV, Curiosity Stream, and YouTube. 3rd party repositories, such as the SlyGuy Repository, contain more plugins like Disney+, Paramount+, Hulu, and Netflix.
Pro Free
Pro Open source
Completely FOSS, licensed under GPL 2.0
Pro Great customization/multiple skins
You can change navigation flow and other aspects of Kodi with the plethora of customization options and skins.
Pro Can play many different file formats
It supports Blu-ray Discs, CDs, DVDs, USB Flash Drives, local Hard Disk Drives, AirPlay, network file shares, basically every video, audio, and image format available, subtitle files, and even retro game console ROMs.
Cons
Con Needs registration
You need a PLEX account even if you use it on your local LAN.
Con Proprietary software
Unfree software.
Con No gapless audio-playback
Plex still does not support gapless playback of audio files such as mp3 or FLAC.
Con Playback error: This server is not powerful enough to convert video
More hardware requirements on Plex due to a useless/non-intuitive transcoder. When using lower spec hardware (eg SBC) Plex will not transcode or play HD+ videos. When compared to other packages (eg Jellyfin which transcodes nicely using FFMeg), Plex falls short on video playback and transcode settings to get videos to play (fastest/lightest option still fails).
Con You may have to jailbreak some devices
This is only for things like a Fire stick, but Android TV boxes etc. should be fine.
Con Terrible navigation
Menus over menus with dozens of submenus.
Con Not Client/Server Capable
While most solutions provide a client/server setup the KODI developers REFUSE to adopt this approach forcing individual setups for every device.
Con Poorly optimized
Often not a fluid experience on low-end devices.
Con No official AAA addons for streaming services
It does not have any official AAA addons and fully relies on the community which result in often broken packages/addons.