different variables are better on each option. but when albums are mixed/mastered using speakers in a room, the expected playback system should involve speakers in a room. IMO everything else comes second to that. but ultimately, with different mixing/mastering habits, or with better than just crossfeed(real use of complete individual HRTF), then I agree that we'd achieve better fidelity with headphones. and maybe a subwoofer for the body shake^_^.