Having read thru my notes, he says a lot about tempi [see above], much about sound [Tennstedt's first is too boomy, his second boxy, Gergiev's too cavernous], the balance [rarely got right, Abbado does], feelings [MTT is full of joy at the opening, Maazel joyless], general impression [ at the beginning of side 2, Boulez gets the orchestra to convey the right sense of emptiness and detail; at a particular point of entry of the Chorus Mysticus, Bernstein achieves 'an ethereal quality']
And so on.
And it is but one experienced listener's view. Heaven forfend that we all agree about everything.
M8 is one of the work's where I haven't specially made choices, oh, except Horenstein [but that's my problem, I know]. Still getting to grips with it.
Ivor