Question about bobbin materials in Output Transformers

[makinrose]

There seem to be a lot of conjecture about whether modern plastic bobbins are as good sounding as traditional paper bobbins.  I've seen a two different opinion pieces on the subject but  the articles were both published by transformer companies with apposing views on the subject and who each adopt a corresponding different manufacturing  technique. No data or evidence was cited in either article.    I haven't seen anything scientific or logically convincing on why one manner of construction would sound different from another in the same design.   Is there a technical reason to think the two manners of construction should sound different?  Are there other reasons to choose one type over the other?