I’ve only ever played two Mayones, the Regius and Setius that I own.
I like the sound of the Regius a bit more for all-out metal, but the Setius a bit more for non-metal. It’s a bit more ‘resonant’ and very deep sounding.
They’re pretty different guitars, bolt on vs thru neck, arch top vs flat, they feel and play pretty different. From the differing design and construction of their different models, it seems like it’s hard to compare them. I’ve never tried a duvell but I’d bet it’s unlike either of the Mayones I have. Not surprising if someone likes one model and dislikes another.