I can't really narrow it down to a single year but more along the lines of a time period of 2 and half to 3 years, 94-96. Some of my favorite albums came out around this time along with a lot of music from differnt genres that I liked as well. Also some of the best music from some of my favorite bands.
Not in order of favorites
Alice in Chains - Jar of Flies
Green Day - Dookie
Beck - Mellow Gold and Odelay
NIN - The Downward Spiral
Soundgarden - Superunknown
Our Lady Peace - Naveed
Live - Throwing Copper
Weezer - the blue album
Beastie Boys - Ill Communication
Stone Temple Pilots - Purple and Tiny Music
Manic Street Preachers - Everything Must Go
Bush - Sixteen Stone
Sublime - Robbin the Hood and their self titled album
Pulp Fiction soundtrack
Radiohead - The Bends
Collective Soul - self titled
The Tea Party - Edges of Twighlight
Alanis Morrisette - Jagged Little Pill
Presidents of the United States
Shania Twain - The Woman in Me
Garbage - self titled
Blind Melon - Soup
Oasis - Morning Glory
No Doubt - Tragic Kingdom
Marilyn Manson - Smells Like Children and Antichrist Superstar
The Smashing Pumpkins - Melon Collie and Infinate Sadness
The Fugees - The Score
Sloan - Twice Removed and One Chord to Another
Rage Against the Machine - Evil Empire
There were plenty of other bands that had some great stuff out at the time as well like The Offspring, Ween, Pearl Jam, Nirvana, Notorious BIG, Tupac, the Cranberries, The Roots, White Zombie, Eveclear, Foo Fighters, Ben Folds Five, Incubus, The Verve Pipe, Type O Negative, Faith No More, etc.
Also some good greatest hits like Aerosmith, Black Sabbath, Bruce Springsteen, Michael Jackson HIStory, Def Leppard, The Beatles Anthology, and Poison.
Yeah, Iwould have to say that 2 to 3 year time period would be my favorite.