I don't mean to bud in on your guys' Haitink love-fest (bleccccch! - I'd sooner kill myself)
, but I've been revisiting a number of M6 recordings myself. I'm really taken by Janson's straight forward, no-nonesense approach, combined with the thorough musicality of the Concertgebouw Orchestra (perfect balance between all four sections of the orchestra), all captured with a reasonable amount of hall ambiance from the Concertgebouw itself. As always with this orchestra, the woodwinds and percussion are outstanding. The brass and strings are reasonably good too, especially the upper strings. While perhaps straight forward to a fault, Jansons doesn't put a foot wrong anyplace. Nothing strikes me as being under tempo anywhere, either. I think that Wunderhorn would like this one much more than the Chailly. Janson's 23:45 timing for the first movement is closer to the mean (Chailly is well over 25 minutes). And while Jansons and Chailly have similar timings for the scherzo (13 - something), I find Jansons' to be more sharply etched. In the andante movement (placed second here), Jansons starts slower than Chailly, but he makes a big accellerando going into the movement's climactic passage. This is in direct opposition to Eschenbach - who I do like - who actually gets slower over the movement's climactic passage.
Just as with Chailly, Jansons eschews any reinforcement on the second hammerstroke. Maybe that's just a Concertgebouw "thang" (?). Both conductors are good in this movement, but I think Jansons does a slightly better job overall. At the final allegro "charge", just after the second cowbell episode, you can really hear those fast runs in the upper strings. I find that very thrilling. All that said, there's just one spot where I feel that Chailly is clearly better; and it's an important spot: the very last several bars of the entire symphony. At the end, Jansons is rather fast with that final A-minor outburst, fading down to nothing. Chailly takes it incredibly slow, yet very rhythmically in the timpani.
I feel that this is a Mahler recording that's very easy to overlook. Afterall, Jansons recorded it before with the LSO, and the differences aren't all that great. However, I like the sound better on this one, as I've never been a fan of James Mallinson engineered recordings (he did the Haitink/CSO M3). They always strike me as sounding a bit "dry"; possessing a lot of width from side to side, but not a lot of front to back depth. However, it's just the thorough musicality of this endevour that really wins me over. I think it's a very good, straight forward, no-nonsense presentation of the symhony at its more earnest. And by the way, this one works perfectly fine in either A/S order (as recorded), or in S/A order.