A good way to compare in GM I is to listen to the start of the 4th movement -
how is the orchestral playing and how detailed is the sound, what is the level
of commitment ...
I don´t have that many recordings of it - Bernstein on DG, Leinsdorf, Scherchen,
Tennstedt, and Ozawa on DG. Of these, Scherchen´s is the best as to reveal the
manic and avant-garde elements of the work, by exaggerating tempi etc. The sound is
better than most of Scherchens recordings, but not luxurious. Ozawa is the only
one to include the usually omitted "Blumine"-movement in the symphony, and by
comparing it to the others, I actually found it the best, intense as well as architecturally
structured in the ongoing events, and - surprisingly - better than Bernstein.
Leinsdorf was the least interesting and had poorer sound, but Tennstedts was also
quite good, the sound picture being an attraction in itself. As regards Kubelik and
Solti I haven´t heard them, but Solti tends to making a lot of noise but less organic
structuring of the events, often lacking melody. ThereforeI would instinctively prefer
Kubelik; he has made some very good GMs, for instance GM II, which I find one of
the best versions, and GM VII, which is unusually atmospheric in its nature-sounding
playing and nocturnal moods. But: Ozawa is good, even at budget price, Scherchen
and Tennstedt serious candidates as well.