@KnowItAllTeen You bring up a rather controversial issue among dome designers. It seems to come down to form vs function. Engineering will always choose the cylindrical base; architecture will always demand the untainted sphere.
Domegaia happens to be led by an architect therefore their domes are purely spherical, always, no exception. My friend is a retired engineer - his dome uses the cylindrical base.
I have yet to hear of a pure sphere aircrete dome developing cracks at the equator. But that is not to say that I won't at somepoint in the future.