Kernel live patch, security updates for packages that canonical doesn’t own/maintain, and access to certain configurations/options like fips

Fwiw you don’t need to cancel or trial anything. Everyone can get free Ubuntu pro licensesbfor up to 5 machines

That’s fair. I can’t say it feels more bloated to me, but the tablet/mobile issue is definitely a big one if relevant for your players.

Not really the topic, but why do you want to run owlbear alongside foundry? It seems like a slimmer alternative rather than something to use in conjunction.

To actually answer the title post I just run foundryvtt and I have a bunch of RPG manuals backed up in Nextcloud so I guess that too