Changed my favourites since my last reply. My absolute 1989 favourite is easily Altars of Madness of Morbid Angel.
Some others I love of 1989.
Exodus Fabulous Disaster
Tesla The Great Radio Controversy
Nirvana Bleach
Alice Cooper Trash
Motley Crue Dr Feelgood
Red Hot Chili Peppers Mothers Milk
Soundgarden Louder than Love
Aerosmith Pump
Overkill The Years of Decay
Bolt Thrower - Realm of Chaos
Ministry The Mind is a Terrible Thing To Taste