What is the best sounding Mahler symphony cycle?

Yeah, their Fourth is a keeper.  Started listening to their Sixth today but haven’t formed an opinion yet

More  Budapest...I auditioned the Sixth.  It’s Andante-Scherzo, which I don’t like but can correct with a touch of the remote.  And there is some great playing here, particularly strings in the Alma theme and elsewhere.  However, I am starting to concur with Mayor Adam..they sound like they don’t have the cahones to complete with the big boys in this, Mahler’s most ferocious conception.  They are a relatively small band at around seventy players, and I think that they should have augmented themselves to compete with the likes of Chicago, Berlin, Vienna, etc

Has Mariss Jansons with the RCO been mentioned? I’m listening to the #2 live recording and the sonics are excellent. Not the most powerful rendition, but every detail by the Concertgebouw is heard with no harshness and with plenty of air and space defining the soundstage. The instruments and venue are well mic’d and provide 3 dimensional sound.
In hires it’s a most enjoyable experience.

lowrider 
   I really respect Jansons (R.I.P.) as a builder and maintaner of terrific Orchestras, namely the Concertgebouw and the Bavarians.  However I don’t care for his Mahler.  Sonically, agreed, wonderful stuff.  My issues is that he reminds me of a dog walker that needs to arrive at a destination but is delayed by his dog sniffing everything along the path.  He tends to beautify the micro moments and loses the structure.  His Bruckner is a bigger mess for that reason 

@mahler123, I agree with your impression. He’s not much of a Mahlerian. It sounds restrained and never really peaks.
I’ve been listening on Qobuz, most recently #6 which I would call dull.
Superior quality recordings on the RCO label. I need to have a listen to other recordings in their catalogue.