I thought this sounded somewhat likely:
"180 Gram" refers to the mass of the glob of vinyl (called a biscuit) that used to press the disc. One twenty and 150 gram pressings are thinner, and hence cannot be cut as deep as a 180 gram pressing. The deeper the cut, the more musical information that can be contained in the groove."
But fair enough. I, and many others, stand a little corrected. Though, virgin non-recycled vinyl's often what ends up in the black releases. And at the end of the day, more coloured purchases I've made do sound shittier, so when opting for the 180gr and/or black whenever possible, one does potentially avoid crap. In doing so, I've never been let down. This would likely explain the other fellow's "precedence" remark.
However, since the black's sold out for this release, I just ordered Neon Green despite everything else!...