Both were excellent. Just told different stories. Infinity War was the story of the war itself. Endgame was the story of the effects that the war had on the survivors. Black Widow and Hawkeye/Robin fighting each other, so that the other might live was the stuff of Greek tragedy. Hawkeye feeling he was not worthy to live after what he had done. Widow knowing that he was just traumatized by the loss of his family and wanting give him a chance at redemption. That the Avengers were her family. A mother sacrificing to save a wayward son.