To me, they're very close. BUT...at no point on RnRc does my head get slammed against the shoulder rest, do I get a headache, or feel like passing out. Hulk does all of that - sometimes one at a time and sometimes all at once. For someone in their teens or 20s, go with Hulk. But once you get close to 40 or move beyond, you want the smooth Aerosmith sounds.