As far as Deutsche Grammophon.
Of the major classical labels, I find them the most inconsistent. Some, even the newer, are wonderful, and some....just aren’t. I’ve found you really cannot go wrong with Decca/London, or usually Columbia Masterworks. Philips actually is pretty consistently good, as is RCA Red Seal.
Of course then you have BIS, Seraphim (Capitol), VOX is surprisingly good, as is Angel (EMI), but they can also be inconsistent. The older Everest pressings/recordings can be very good. Those are the ‘majors’, but there are many ‘boutique’ labels which are very good. I’d probably put BIS into that category.
This is mainly for older pressings/companies. There are some very good newer ‘boutique’ companies today. I just haven’t delved into them....yet. CD’s yes, vinyl no.