Not tried beets (this thread only now made me aware of it), but adding a +1 for Picard

I let it run on a huge chunk of my music and apart from a few tracks it thought should be in compilation albums, worked really well.

After the big sift, I basically just run it on new stuff when I get it…

Sometimes I use Puddletag to fine-tune some data.

I find most new things I get from Bandcamp, etc are in MusicBrainz, so not much editing required… although I have spent some time over the years carefully entering some older, more obscure music.