different live rock gives different effects.
my favorite live rock by preference is:
1) marshall island - import stopped, very expensive but the rock structure is incomparable.
2) tonga - big beautiful branches that creates wonderful open structures. again, shipments have ceased and very hard to obtain except reefers selling their old stock.
3) pukani - small tight lace pattern. very striking intricate appearance. is/was possible to get very large pieces.
4) fiji - good ol' standard live rock. heavier and denser than the others listed above.
5) kaelini - similar to fiji but shapes are more unique. i have never really found large pieces of kaelini thus making it lower on my list.
live rock, good live rock anyway, seems to be getting harder and harder to find. other places have shipped live rock each with their own unique appearance. vanuatu, solomon, bali, alor etc are all great variations of quality live rock.