I'm not too sure which groups still do subs for airing series aside from GJM. Although for BD releases I'd suggest just comparing all the separate releases yourself and seeing which is the best quality. Since sometimes for older anime a new BD will come out that blows any prior release out of the water (Utena, CCS, Eva).
Take for example this picture. It's nowhere near the most releases an anime can have, but it's around average for a popular show.