Death is the best death metal band of all time, even if you consider Symbolic/TSOP to be barely death metal. In my opinion, no other death metal band has maintained a level of 'freshness' and quality on album after album. Too many death metal bands these days write music to fit a certain sound, forgetting how to write memorable riffs and songs. But that's where Death shines the most. Their albums feel more like a collection of amazing songs rather than a single massive piece of atmosphere like say, Teitanblood's Seven Chalices (not that I don't love that album as well).
Point is, when it comes to what death metal band you can listen to the most without your ears literally getting tired of the sound, and what band made the best, most memorable songs and riffs that you can really rock out to and enjoy, its Death.