I don't think MDisks were compared if that's the study.
https://club.myce.com/t/french-study-on-bd-r-for-archival/30...
https://francearchives.fr/file/5f281a39048987dcef88202816a5c...
https://club.myce.com/t/french-study-on-bd-r-for-archival/30...
https://francearchives.fr/file/5f281a39048987dcef88202816a5c...
I think there was a French study that compared DVDs, M Discs and BDs and the HTL BDs fared very well. Can't find the document though.