I'm pretty sure they had a bit of everything. Lot's of adobe and brick, all sorts of roof styles, and some just awful shantytowns narrow urban slums and rural "slums" of tiny, crowded adobe sprawl.
Also, coral block, especially near the coastline, and rmember that many rsidences and buildings were very old then..
That's what I have seen in every book on the subject.
In my opinion, adobe with Spanish tile is a winner for that scenario, and maybe some old wooden farmhouses or out buildings.