There's really two types of "City Games" - city painters and traffic simulators, Cities Skylines is basically the second with a bit of the first, whereas SimCity 4 became the first with a bit of the second.
There is also the puzzle kind like Urbek, which has a nice SimCity feel but you need to make sure that building type X is (or is not) within Y squares over several levels of development. And more along that line there are a bunch like Farlanders that aren't really builders at all but pure puzzle games that happen to use buildings as graphics.
