I also find these differences interesting. Most of the time (at least where the mission allows it) I am personally shooting for a vague surrealism, of weighty but slightly improbable construction and a sort of over-urbanisation that's most definitely hostile and claustrophobic. I am also keen on inscrutable advanced technology. This style was inspired by earlier FMs (Calendra's Cistern, Assassins, Rocksbourg and Uninvited Guest), and is related to the missions skacky, squadafroin and firemage are doing nowadays. It also draws from the narrow alleyways and constant height differences of the ancient Mediterranean cities, which preserved a lot of their mediaeval character. However, as Gothic architecture goes, it is not the rich and ornamental Gothic of the great cities, but the more simple and austere "poor man's Gothic" of Central Europe (which I prefer). Others, I think, draw on different sources. Springheel's streets are more historically authentic and are far more real than mine, and they seem to draw on Georgian-era ideas. Lots of junk, lots of mud, and more realistic technology. Spooks has also gone for this style with a wonderfully realised outer city district in King of Diamonds (which has a lot of the character of period slums, from the backyards to the tightly packed housing). Then you have Grayman's city mission, kvornig's more Victorian take and Sotha's (which has a kind of mediaevaln romanticism? Johannes Burock seems to be going for something similar with his WIP) - again, different concepts, and all very fascinating. I don't think these alternate visions can all be contextualised at the same time. You can put together some of them some of the time, but not all of them all of the time. I personally don't think there should be a complete canon, although it is fun to see people building on each others' ideas.