What is normally thought of as butterscotch can only be achieved with bakelite or catalin material. Hardcore aficionados don't even seem to want to recognize some of the old bakelite brushes that have the butterscotch color deeper than just the surface layer(they were manufactured that color). Instead only recognizing the ones that started a creamish color and over time turned butterscotch.
All that being said, the penworks and Rudy Vey brushes with handles turned in their beautiful butterscotch resins would be a worthy addition to anyones shave den. Get what makes you happy!