Today on a long car drive I listened to several movements of both the Schwarz and Zinman M6s. (The Zinman is the 'regular' CD that came with the DVD). I like both performances. Overall, the sound of the Zinman recording is the more satisfying of the two with its wide sound stage and hall ambiance. I also prefer several of the individual movements (primarily the first and the Andante).
Schwarz, often fast, has the gross structure that suits my 'program' for the symphony. Though the first movement timing is very similar to Gergiev's, under 22 minutes, it didn't annoyingly rush by. The cowbells are nearly ideal to my thinking: full of mid and low tones, randomly shaken but dense, and not too present. The Andante is akin to Jansons, a tad long abut certainly not as lugubrious as Eschenbach and Bernstein. I really like his Scherzo; not as fast as Mackerras but faster than Zinman and always engaging. The last movement is among the fastest in my experience, and on the count should fail to persuade, but it works for me, start to finish. The 3rd hammer is a plus in my scoring (no pun intended). The horns are magnificent throughout the symphony (as a horn player, I'm severely biased on this point).
Besides the sound, where the recording also disappoints was not initially evident. After a few hearings I realized the low brass are often very reticent. For example, in the first movement I like the trombone's descending eighths in the 12th measure to be like a snide laugh, repeated by the trumpets after Rehearsal 2, and then by much of the orchestra after Rehearsal 3, but I can barely hear the 'bones in this recording. Elsewhere, the tuba is not nearly the snarling menace of other recordings. I suspect all this is a matter of miking: when sampled back-to-back with the Zinman, it was quite apparent.
Overall, like the Zinman/ZTO, the Schwarz/RLPO is a keeper performance in my library.