Was trying to keep the reply short. I use the new built in MusicBrainz EAC Metadata Plugin to get tag data that matches the CD. Previously I used the CUE Tools DB Metadata Plugin.
I find the built-in plugin does have problems with things like dates as it expects a four digit year and can’t handle a full date. I usually have to type my own year into the box.
It is not needed if you have an EAC log from the rip. Just drop the log on this page and it will calculate the DiscID from the ToC in the log.
A CUE file is too old and basic for my needs. I don’t really make use of them. The FreeDB discIDs inside them are very different to the ones MusicBrainz uses. I think they also lack detail and have more clashes.
As long as you have kept your EAC logs, you don’t need the freedb DiscID in the CUE. I have returned to rips without a CD and dropped the logs into that website, and then pushed the found release back to Picard to work on the tagging. And yes, that also works on Enhanced CDs and discs with pregap tracks and other oddities
Edit: Linky on how to search those freedbIDs. Freedb discid translation That page also explains some of the differences.