Even though Pink Floyd made a couple more albums after Roger Waters departed, most people feel that "The Final Cut" punctuated the magic.
Any preference between (as per the header) Led Zeppelin's and Pink Floyd's final albums?
(Is "The Final Cut" more Roger Waters than full Pink Floyd to you?) ?
How about other "bests" in terms of final albums? ANY era.
Also ... another possibility is this:
If there are bands that are still recording, but have lost their magic, in your estimation, name the album that you feel put the puncuation mark on the band, the "final" album that marked the end of your interest in the band. They were great up until ... ?
NOTE: Please exclude Abbey Road, for obvious reasons. :)