Alex,
I didn't think there was anything confusing or misleading in terms of which material was more black, less reflective and less hairy. I'm sharing some actual data showing a side by side comparison of the above qualities - not just an opinion.
I've used both of these materials on the inside of Newtonian and Schmidt Newt OTAs and based on that experience, I'd buy the Scopestuff one if I wanted something that is black, low reflectivity, doesn't shed hairs and has excellent adhesive performance over a long period of time, but that's just my opinion.
You mention "in an actual in-scope application any difference may be very little or insignificant"...or it may be significant - only some specific data will help us decide.
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