The most important characteristic, which you left out, is the hardness of the aluminum in the lobes. Aliens have softer "sticky" aluminum which, combined with their narrow head and overall design, make them indispensable for granite, particularly granite with pin scars such as Yosemite.
Overall, "area specific" gear/racks are almost entirely a myth. Yes, in Indian Creek you will need a massive number of cams. Everywhere else, a standard rack will be fine and brand does not matter.