I'm using a mixture I've stuff I cured with some fresh stuff. The local equivalent of "premium live rock" is base rock that's been sitting in a fairly poor excuse for a marine system with no real signs of life beyond a bit of brownish algae, so I padded out the real live stuff I could get with a bit of base rock. I managed to get more life on base rock in 3 months of curing in a kiddie pool than the LFS has on pieces of rock it's had in its system for years (it admits it rarely sells the stuff).
That said, I'm a fan of a bit of both. I started a nano with above said "premium live rock" and for the entire time I could barely get the cycle to finish, and had no useful critters to help clean (worms, fan worms, a million other weird things), and no sign of coralline. Added a bit of fresh live rock, and the tank took off. A few annoying hitchhikers, but you're gonna get them one day anyway.