well, this probably isn't of much help but I know people are really sexed up over the 1Z Metallic Polish. I've got to get a bottle ordered and find out for myself.
OTOH, I have the Menzerna polishes and they are very fine products though not very aggressive. If you have serious surface correction to deal with, they may not be enough. I have worked a couple of cars that were in excellent shape with the Menzerna polishes and the result was (non-clear coated black paint) admirable...the black paint looked wet enough to dive in to !