Most moons in the solar system keep the same face to their planet. That doesn’t have to do with their structure, but comes from tidal friction – the planets raise small tides on their surface, but friction means these are a bit behind where they should be, and the gravity pulling them to catch up eventually slows down the moon’s rotation.
That our Moon only has the dark maria on the close side is more mysterious. The general theory goes that the crust on this side is thinner, possibly because of heating from the Earth back when they were both first cooling, but I don’t know how well established that is.
