These recurring threads are silly and fun at the same time.
Aja? Walter Becker kept his platinum award in the outhouse to his Hawaii studio. And for good reason. It does not hold up. Add to that the simple fact that Donald Fagan was an anal-compulsive in the studio and that the pursuit of perfect musicianship from a technical perspective killed off the life of what could have been monumental recordings. I am a Dan-fan and for me Countdown to Ecstasy is their best, but it could have been so much better if Fagen had not obsessed over every aspect of the band's playing, mixdown, and production.
The easy picks imho are Kind of Blue and Revolver. But being human I have sentimental favorites and for me they are ZZ's Tres Hombres and Alejandro's Real Animal. And for something no one or almost no one knows about there is Chuck Prophet's Age of Miracles and Southern Country on the Skids' Dirt Track Date.