everyone always mentions the tampa bands like morbid angel and deicide, but it's like incantation and immolation get forgotten constantly. WTF dudes.
the names that really battle for GOAT in death metal are suffocation, incantation, and morbid angel. cannibal corpse probably wins for pure consistency, but CC doesn't have any albums like effigy of the forgotten, onward to golgotha, or blessed are the sick.
if you wanna talk some heavyweights of the modern era, there's always portal, ulcerate, antediluvian, disma, behemoth, a bunch of others.
also don't forget some older forgotten gems like demilich or disembowelment.