I've got both Florida live rock and Pacific live rock. Long term, I prefer the Pacific by far.
The interesting life on the Florida live rock has mostly died off. I still have some bivalves, but the majority of them have met their ends to peppermint shrimp or urchin grazing (the urchin manages to shave off a bit of the shell along with coraline algae -- bad news for the clam). The sponges, worms, feather dusters, forams, etc. that have survived are not visably different from those in pacific-rock only tanks I've seen.
Aside from the loss of the inital life, my big complaint about the Florida rock is that it's basically softball to bowling ball sized hunks of solid rock -- very dense, not very porus, very boring shapes.
My pacific rock (Phishy Business premium / select @ $6 per pound) had plenty of hitchhikers (chitons, snails, worms, mushrooms, a 3 inch filter feeding clam, even a Galaxy coral that's now softball sized, etc.). Some of that may have been from spending time in Phishy's holding tanks. A larger amount of that life, per capita, has survived -- probably because it had to be pretty tough to begin with.
I've had macro algea show up from both types, and plenty of pods, etc.
The pacific rock has much better shapes, and it's lighter, more porus, and more "reef looking". Burrowing critters like the pacific rock, but the Florida rock is too hard (basically petrified stuff that was mined, then dropped or hung in the bay for a few years).
My florida rock now acts as a base for my pacific rock to stand on, and I've considered taking it out to make space.
Of course, it's up to you what you want to do with your tank, but I'd get all pacific rock from
www.phishybusiness.com or
www.premiumaquatics.com if I were doing it again.
John