Are you talking about if you have no rock at all and a brand new tank? In that case, I would buy 30% live rock, and the rest dry rock, specifically Marco rock. I just bought a 50 lb box of dry Marco rock last week, for a new tank that I am setting up. But I already have an existing tank with live rock, so will mix in live rock with the dry rock.
With new live rock you run the risk of bringing unwanted pests. And you may still have to cure and cook it, to be sure it is "clean" before adding to your tank.
I have my new Marco rock in a tank mixed together with some live rock from my existing tank. There was no ammonia or nitrite at all, so it is already fully cured, after less than a week. I do have nitrates, but not sure how much of that is coming cycled through from the new rock, as my live rock came from a tank that already had high nitrates.
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