Brian,
We are referring here to the saturation capacity of the Claria vs the Ultrachrome.
When comparing an inkset to another inkset the 2d plot determines which has greater saturation capacity.
The metrics with 3D plots you mention are for judging a paper & print driver profile quality. I thought the conversation was regarding the gamut potential of the 2 inksets.
The quality of the profile is not the sole characteristic of the inkset. It is the quality of the profile mapping, driver and paper.
One can make a poor quality profile with an outstanding inkset all too easily. and vice versa.
Ink limits, GCR/ UCR, multi color limits, gamut mapping settings, ink laydown order, etc all can either make or break a profile
which is where 3D plots come into play to show the quality of the PROFILE and not the ultimate measure of the inkset gamut.
Remember that the most saturated colors are not the highest inkload. The poor shadows of the Claria profile simply tell us that there is low chromatic black generation in the driver, which is unfortunate but
an ink saving technique for a desktop printer.
Granted most people are simply using the windows driver which is what most of these plots are based on and do not get every last bit of fidelity.
I don't really want to get into a tit for tat conversation but we were talking about the gamut volume of an inkset and the 3D plot confuses the subject with variables not solely attributable to the inkset.