Having grown up with grunge, I have to say, it would be Singles.
This album is possibly the best representation of grunge, even more so than many of the more popular grunge albums.
Pearl Jam, Alice In Chains, Chris Cornell, Mother Love Bone, Smashing Pumpkins, Screaming Trees, Jimi Hendrix, Mudhoney... Check out Cornell's Seasons for example. He only re-released it a couple of decades later when he went solo. And what a song!
And of course, Mother Love Bone's Chloe Dancer / Crown Of Thorns. Probably one of the best rock ballads I have heard. The buildup, the lyrics, the melody, the quality of vocals. Everything
https://www.youtube.com/playlist?list=PL67A7FB29FE006B61