Roon uses both Rovi and MusicBrainz. It is not a question of what one “should use”, but what Roon actually uses. I am sure they have some insignts as to how that data is build.
Allmusic is great. A music bible of sorts. I really appreciate a lot of the writers. It’s a big reason I signed up for a lifetime subscription. Sure, not every album released is reviewed and some credits are incorrect. But it’s an incredible resource and far better than anything else out there!
All good. I just wanted to show my appreciation for AllMusic. Like I said, the credits can be a crapshoot. But I do love the ability to click on “credits” and then click on that particular person and see what else they’ve done. But there are definitely some holes there…