What is your favorite Strauss The Last Four Songs?

I have opted for E. Schwarzkopf/Szell over the Ackerman. Even though Ackerman's earlier version offers a younger Schwarzkopf, I like the maturity of her voice in the Szell version & the classicism of the latter's conductiong.
For the Metamorphosen, I presently favour a Janowitz /Academy of London/R Stamp version on Virgin (which also has the Four Last Songs) -- but I'm sure I need to research this piece better...

Janowitz and Popp are my two favorites, but Barbara Bonney, with only piano accompaniment, is also delightful.

I've enjoyed Norman with Masur for a long time.

Also Schwarzkopf-Szell.

Another winner is the more recent Isokoski-Janowski recording suggested by Dave.

 

 

A clear winner for me is Gundula Janowitz with Von Karajan conducting.

One that I am also attached to is Jessye Norman with Kurt Massur conducting.

There are also a good number of others that I like in certain songs in the set but not all four. 

My satisfaction for the two named are because I can find nothing to criticize in them.

Felicity Lott, an unlikely recommendation, and Jessie Norman are my go tos