Herb, those were not 'my' statements.. they were in the question to Redfox about his judgment on those issues..
I do not know either to be true for sure... but on the first I am leaning from what all has been said to believing that Duracool is better than 134a.
I have said that I do not know enough about the criteria to ask critical questions which might point out something important to the comparison.. hoping that someone else WITH this kind of technical knowledge will jump in and say ' yes that counts" or "no, something else is the deciding factor"....
My basic position comes from reading what I have been able to find about ac systems... that is why I have an appreciation for R-12 ...but with that goes an appreciation for following the other rules when servicing it....
I have to trust that others here will read close enough that they understand that the misrepresentations, personal attacks, and silly statements like " I can get the proof , but why bother" are very suspect activities when it comes to defending something where the physics of the item are the basis for analyses of its merits or drawbacks....