I would give a strong recommendation for the Decca sessions of 1935-1946.   Maybe some of the chosen songs leave something to be desired, but this is Louis Armstrong in his absolute youthful prime giving mostly timeless interpretations of jazz and pop standards.   Much of his later work with the All Stars is also fine, but I would it a notch below this.  There is also a box of the complete RCA recordings (not on Mosaic), which are absolutely essential.  You already have a taste of that on the Portrait of the Artist box. 

Those Armstrong sets are kind of pricey right now, no idea why.  But if you set up notifications on ebay, discogs, and what have you, and watch for a while you can generally get them for the original price ($15-$17 per disk), or less.  For ex in 2022 I picked up #146 The Complete Decca Studio Recordings of Louis Armstrong and the All Stars, for $78 (box, book, the works, shipped). Two are available on spotify (and presumably as downloads from the usual sources):  Louis Armstrong The Complete Louis Armstrong Decca Sessions (1935-1946): https://open.spotify.com/album/4ePSSZbkcek6jALbNtztI8?  Louis Armstrong Columbia And RCA Victor Live Recordings Of Louis Armstrong And The All Stars: Vol. 1: https://open.spotify.com/album/7GwSrFicvM59OYCAFsDB4q Vol. 2: https://open.spotify.com/album/5oPUTne7UdDcLUsRKpODvW Vol. 3: https://open.spotify.com/album/6caWTu3uR6ykaFv1asaqwG

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