The Salonen has a decent finale - nothing special - but the first three movements are really perfunctory. I really like the Pappano for reasons I've already stated Anyway, here's what I said at Amazon about the Salonen (I gave it 4 out of 5 stars):
a fine Finale but a tad lightweight in the first 3 movements, November 17, 2011
by B. Guerrero "Mahler nutcase"
While I was pleasantly surprised - shocked, really - with the results with Antonio Pappano's new Mahler 6 recording for EMI, I'm afraid I'm a tad disappointed with this new Salonen one. Part of the problem, I feel, has to do with the Philharmonia itself. They simply play Mahler too politely these days, and aren't willing to dirty their finger nails with Mahler's many deliberate sound effects. To cite just one example, the brief passage for 'stopped' horns near the end of the first movement is nearly inaudible (the horn's tone is 'stopped' by sticking the right hand farther into the bell, producing a metallic, 'buzzing' sound).
To my ears, the Philharmonia was a far greater Mahler orchestra in the days of Klemperer and Barbirolli. Others might think differently, but I feel that this is no real match for either of Barbirolli's recordings with the same orchestra (EMI studio vs. Testament 'live'). Yet, there's no denying that things perk up greatly in the finale. The problem is that the first three movements are quite perfunctory, relatively speaking. If one is looking for a generally quicker, 'giant Haydn symphony on steroids' approach to Mahler 6, I would suggest that one stick to Boulez/Vienna Phil. (DG), Abbado/Berlin Phil. (DG) or, even better, the recent Saraste/Oslo Phil. Mahler 6 on Simax. If Andante/Scherzo is your preferred movement order, stick to Abbado/BPO or David Zinman on RCA (I prefer the Zinman). While also a 'live' performance, the sound quality is a bit better on the Simax issue (Saraste).