It's not that it has a lot more features but the flatpak is official and it's desktop native whereas this app is a third party that works through ATL so why bother switching.
It'd be great if these type of apps came up with a shared data format and allowed you to P2P sync with Syncthing.
Freetube on desktop Linux hasn't worked for me for a long time - but that doesn't seem to be the case for most people. Any tips regarding settings? I'd say it's been at least 3 or 4 months since I could reliably use it.