Thanks for sharing, Russell. I've been really enjoying Hurwitz's channel, even though I tend to disagree with him about some Mahler things. Plus, he's funny as hell!
I think the Ančerl is very good, but I personally wouldn't put it as a top choice. I do agree with him about the Gilbert, Chailly, and Karajan live though.
My top five, in no order, might be: I. Fischer (controversial, I know; I used to hate it but now the swifter tempi make sense to me; plus, the score suggests 75 minutes and that's what Fischer does; his first movement is a proper andante), Karajan live (better than his studio), Gilbert (I agree with Hurwitz; it's the most balanced and maybe best played), Chailly (my favorite slow account), and Boulez (I actually like the swift finale; it reminds me of the beauty of life rather than the tragedy of death).
I think just about everyone has very different top choices for M9!