i have to admit mine would probably be the Works, but i like the phase freddie went through at the beginning of his career...wearing ballet pumps with long hair, etc.
I'd say Quen II. I like early Queen, before any attempt to make it accessible to the masses ever took place which I deem somewhere in the making of Sheer Heart Attack. Queen I has that purity, but wasn't a proper recording of musical genius, but a time-limited production. Only Queen II gave the band unlimited access to making a completely purified musical product.