It just depends on what your downstream tool wants.
Most unstructured aero tools are happy to deal with Tris.
Most FEA tools want quads. So, our ability to make quads came from our FEA stuff -- we just turned on the option in CFDMesh because we could.
Frankly, our quads are pretty lousy (but they do have four edges), so don't use them unless you really want quads.
Rob