When comparing Jellyfin vs MediaPortal, the Slant community recommends Jellyfin for most people. In the question“What are the best open-source media servers?” Jellyfin is ranked 1st while MediaPortal is ranked 2nd.
Ranked in these QuestionsQuestion Ranking
Pro Open source
Pro Completely private
Doesn't phone home.
Pro Good emby fork
It is a fully open source fork of emby.
Pro Less intensive/more flexible options for transcoding
More control over transcoding and seems to transcode far better on lower spec hardware (eg SBC) than other packages (eg Plex).
Pro Easy to set up
Setting up tv series and movies take little effort to set-up.
Pro Portable version
This version runs on systems with a .NET Core runtime.
WifiRemote plugin that allows clients (for example an iPhone or Android app) to control MediaPortal.
Pro Web / mobile access
Remote access using your web browser, Android, iOS, and more.
Lots of plugins and skins available.
Con Slow web interface
For large media libraries, on lower spec hardware (eg SBC), images can take some time to initially load when changing pages/sections (v10.6.4).