Second one. Its simple and neat, plus sustainable. ukizeeka you won't need going upstairs. Another thing with the maisonettes of which most people don't mention is service cost that comes with it(general repairs, cleaning, electric bills etc). But do you.
Depends where you shagz is located. I would recommend 1 for the central region shags where land is scarce and people have developed generally. No. 2is conservative and good for those interior places where your family will not have to attract unnecessary attention from the villagers.