I just felt like Liquid played a lot more things like Metallica, and a lot more older metal like Iron Maiden. I don't remember ever hearing any hardcore after they merged, either. Hard Attack didn't play a ton of hardcore, but at least they played some.
Still, either is better than the metal you'll hear on terrestrial radio, that's for sure. (most of the time, one local station has a metal show on every Sat. midnight to 6am that plays great music, uncensored.)