Multiple [Quality] Versions of the Same Movie

[ThomasPGH]

I know Jellyfin can handle it fine...

Actually, it can't. There's tons of bugs that were introduced with the 10.10. versions that never got fixed.

Jellyfin infrequently refuses to add films with multiple versions to collections.
When you start one version, the Continue Watching section lists all of the different versions.
If you later delete a version, you'll never get rid of it. It seems the database is never cleaned up properly.

Also, if a film with multiple versions is part of a collection, the collection's XML file grows infinitely with every single library scan. You'll end up with thousands of duplicate entries.

I would recommend that you try to avoid multiple versions since the issues are so obvious that it can easily be deducted that none of the devs are using this feature.

For example, if I have the Porco Rosso 1080p Blueray version ripped, is there a reason to have 480p DVD version as well?

I'm just trying to see figure out if it's worth my time ripping the DVD if I have the Blueray.

Apart from the beforementioned reasons, are you sure you would like a 480p video in your library? This looks awful on a modern TV or PC screen.