Fwiw, my music prof. likes Gothic Voices a lot, better than the Anonymous Four. I don't mind the very clear, very straight tone, Anglican-type sound (what a surprise! I sang in one Anglican choir or another for about 40 years) but he likes a warmer sound and so do most people I think.
The anthology textbook for my music course was FULL of Dufay's works. He was the Big Dog of his generation.