Re: Fictional Cities
As a GM and player, I prefer fictional cities for Champs games.
My 3rd Champions campaign (shortly after 4th ed.) was set in Empire City, a city I had created that was kind of a Gotham/Metropolis hybrid.
The hodge-podge nature of the city allowed for all types of scenarios and most players liked the "big" feel of the city (although a few felt there was "too much", which I disagreed with).
The city's history got richer and more involved as more players joined the campaign and their backgrounds were incorporated, plus most of the (pre 5th ed) Champions sites of interest were integrated there, such as the Circle, M.E.T.E. , Dr. McQuark's Super Hero Supply And Gymnasium, et al.