Just for fun, here are the highlights for me on Nott and Stenz:
Nott - 2, 4 (incredible), 6, 7, 9
Stenz - 3, 4, 6, 7, 8, and Des Knaben Wunderhorn (among the best, IMO)
And just for good measure, here are my highlights for A. Fischer: 1, 3, 4, 7, Das Lied (I also liked what I heard of 6 so far)
To go along with the topic of picking favorite complete cycles I would choose Chailly, Kubelík, Gielen, Stenz, Boulez. Call me the lover of ‘detached’ Mahler conducting. Honorable mentions: de Waart and Bertini.