In one issue of Prog magazine, Eric said he never thought of the Cult as a metal band but thought of them more as a prog band. Even though some dubbed them "the American Black Sabbath" he felt they had more in common with King Crimson or ELP. There's no doubt that they were WAY more versatile than Sabbath.
Nevertheless, it's hard to beat the ripping rock of "ME-262" or "The Golden Age of Leather."
Blue Oyster Cult: Golden Age of Leather - YouTube