John,
The de Waart cycle has a few winners in it. Not first choices but mid-to-top contenders, at least for me. I also wish he would have had a shot at Mahler with SF, an orchestra of tremendous potential when they are not being asked to pirouette along with MTT's self-conscious mannerisms. I just revisited a few of SF's recordings with Blomstedt (some Strauss and the Nielsen Symphonies) which reminded me of the inherent greatness of that band.
A thought I have had about the Zinman Mahlers as I've collected each installment, is that maybe he is conducting for what the orchestra can give him. I don't believe the Tonhalle, for their many great qualities in music of other composers, has the sound and/or personnel for Mahler. Their strings are consistently weak-sounding as every recording has been tweaked towards the brass and winds, and in the 8th, the organ, percussion and choir. Even in the brass and winds sections they can't compete with the likes of NYP, BPO, BSO, SFO, CSO, RCO, to name but a few. With the bar for performance and instrumental execution having been raised so high by so many previous and current conductors/orchestras, Zinman's recordings--for all the "lucidity, transparency, and careful balance" you hear in them--are, for my ears only, merely good efforts by a good orchestra in state-of-the-art sound.
For me, "revelatory" is also an important component necessary to justify any Mahler recording appearing in the saturated Mahler-symphony market although, I must admit, I end up buying everything that appears out of desperate curiosity and hope for enlightenment. With only Litton to compete with, I sincerely hope that the Tonhalle's Mahler-Carpenter 10th will turn out as "something special." Since it's so heavily dependent on orchestral execution and brilliance, I have my doubts. Now, if only San Francisco would tackle that score with (insert favorite baton wielder here). With my luck, it'll be Ashkenazy or Neeme Jarvi, with whoever is unfortunate enough to let them in the building, conducting something else they are sight-reading.