I am in the beginning stages of a new aquarium and have enjoyed this thread. A couple of thoughts after reading.
1) I may be wrong but it seems there are more worries these days than twenty, thirty years ago about bad hitchhikers in live rock. I wonder if that is due to the popularity of Atlantic aquacultured live rock that goes almost directly from ocean to tank. Mantis shrimp and nuisance crabs for example may show up. Back when I started in the late eighties, I used a lot of Fiji live rock. There was always a good amount of die off in the transportation by boat to the US. Most of these bad critters would not make the trip alive. My point is there is different live rock with different risks.
2. Whichever you choose the key is patience. Dry rock must be cured if it once harbored life or else algae issues may persist. This process may take many months. Live rock can go right into a new build, but I would recommend waiting a month or two before adding additional life to it. This will give you time to remove any unwanted pests before they can hurt your livestock. Either way, if you rush, you will likely have problems.
For me, I am using a mix of dry and live for a 30 gallon tank. The dry shelf and rubble rock are curing now (not cycling, curing). About 8 pounds. I will order about 15-20 pounds of live rock in the spring. Once I add them all to the aquarium, I will wait an additional month or two more before adding anything more than a CUC.
Do not rush this process. Your rock is the key to your system. It performs the bulk of the filtration and provides homes and bases. Take it slow and let it mature. Some will add bacteria supplements with success, but I never understood this. What is the rush? Let your rock develop naturally over time and you will likely be successful.