Which unit layout is the cheapest to build?

[K S.]

From a builder/contractor perspective, which units would be easiest, cheapest and fastest to build?. The layouts include studios and 1bds or a mix of both with or without garages which you can ignore since that's more of a budget thing and not that complicated to build. I wasn't sure how much more it costs for a detached unit like the two duplex layouts (I heard duplex units were the easiest to build so two detached duplexes might be favored but might also be negated by the fact that you're creating two separate foundations. Ignore the extras, just looking at the layout orientations from a high level. Advice appreciated.