Late to this one...interesting choices...still want to be sure of the criteria here Milo, thus just asking again...you want our opinions as to the BEST album (by an artist) or our FAVOURITE?
I will go with some personal favorites first (an aside -many have been mentioned here already so I won't list those) with a brief reason why...
Massive Attack - Protection...whilst their debut was a classic, their sophomore effort really crystalized everything their crew was all about, polished it a little and delivered one of the greatest songs of the 90s in 'Karmacoma'
The Beatles - Sgt Peppers...quite simply one of the two albums I feel has total symmetrical excellence (Dark Side Of The Moon is the other) and the album that basically did poor old Brian Wilson in for decades ( a shame because Pet Sounds isn't exactly shabby).
David Bowie - Heroes...many opt for Ziggy Stardust, and frankly, the man's catalogue is pretty much peerless until the 80s, but my personal favorites were the Berlin period, and of these "Heroes" had the greatest balance; 'Beauty & The Beast' is a sensational introduction...I love "Low" too BTW...
The Sex Pistols - Never Mind The ********...simply superb. 10 punk songs that are actually more like pop they're that sticky. Timeless.
Jimi Hendrix - Smash Hits...the only compilation released whilst he was alive, and as such, for me it's fair game. Has them all. Maestro. I was apparently at the Isle Of Wight but napping. Toddlers will do that. Sigh...
Faith No More - Angel Dust...an album which not only revealed the true dimension this band once had, but the influence they would have over modern music for years to come. Edgy, bold, unapologetic and visceral.
Underworld - Second Toughest In the Infants...a though choice, as Dubnobass...is superb too, but this gets the nod simply for the era and opening track 'Juanita...' soundscaping at 130bpms was never as much fun.
Goldie - Timeless...the dawning of a genre, an era and one of the wildest talents in British music & art (IMO), this album has textures and layers plus some energy! The 'official' launch pad of drum'n'bass (obviously there'd been great stuff prior, but this formalized it as a genre to be reckoned with)...
Johnny Cash - Live At Folsom Prison..."I shot a man in Reno, just to watch-him-die/When I hear that whistle blowing, I hang my head and cry"...the black heart speaking of black heart sadness with the voice of a calm, soothing angel. Incredible album.
...so many more...but I have to get some stuff done...more later if needed...I already know I'll kick myself for what I'm not putting down, but again, some have already been covered.