The Carpenter version takes far more liberties than the others, but it also sounds more filled out than any of them, except for maybe the Samale/Mazucca version. Carpenter brings M10 into the more overtly expressionistic sound-world of Alban Berg's "Wozzeck" and "Three Pieces For Orchestra". I find it very convincing as Mahler/Carpenter. Personally, I don't care for the Wheeler version at all, while the Barshai sounds even less idiomatic of Mahler to my ears. Just speaking for myself, I would rate either of Remo Mazzetti's two versions higher than either Wheeler or Barshai (first version: Slatkin; revised version: Lopez-Cobos). That's just me.
If nothing else, the Andrew Litton/Dallas S.O./Delos recording of the Carpenter version is incredibly well played (it's extremely difficult), and superbly recorded. That has to count for something.