I debated about it (some years ago) with Alfonso Martone on our Spectrum Mailing List.
He claims to be objective, but he's not. Just look at the machine specs comparison on the website. Absolutely partial
I'm not upset by the fact that the Spectrum wins the "battle" (I have 7 Spectrums, and 2 C64, and I appreciated both worlds back in the day). I'm upset by it's way of putting down the C64, even on those aspects in which it's undoubtedly superior.