I have KPA live rock and gulf.
The gulf has more life in terms of corals and macroalgae but they both had the important stuff like worms, dusters, starfish, coralline, pods, sponges, etc
I very much prefer KPA because the shapes and lighter density is wayyyy better than gulf rock. The gulf rock is more dense boulder like shapes and the KPA is more like how we would expect rock for aquascaping to be.
Gulf Live Rock