We don't do scads of paperwork just for the sake of it, have rooms filled with high-charging consultants, nor have we instituted it a grand-scale tick-box process management exercise - but we do think that trying to make ourselves a little better every day is a good thing to do.
This is why we've recently taken some time to make sure that our chosen papers are still the best option for the Art we sell.
It turns out that taking longevity (we only use archival-quality papers), and appearance under as many types of light and glass as we could reasonably get to we decided that there was no noticeable improvement to be found with the naked eye. So we got the 5x and 10 x loupes out, and found exactly the same thing.
We'll be sticking with what we currently use. But at some point in the future we'll check again, just to be sure.
As an aside: you may note that some of the things we didn't consider were paper cost and ease of pre-print handling - those sorts of issues are entirely our problem and shouldn't affect you in anyway.