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Any major 3d package is going to let you build things fairly quickly if you know how to use it. You obviously do not, however, so it's going to take you a long time to learn.
Since you're used to using DAZ studio I assume you're looking for a "make art" button solution - there isn't an equivalent to that stuff for building buildings like that, but Sketchup will let you quickly make something 3d. I'm not sure how easy it will be to get it into a commercial game engine, though, especially since I'm not sure how good you are with programming.
I don't know what you're planning on doing, but since you clearly do not know how to do much of it, you should really consider making a dirt simple game or two to figure out the pipelines you need. Rome wasn't built in a day, etc.
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