Why try to maintain quads?

Sure they smooth better than triangles and n-sideds... but it will smooth a lot worse if the vertexes aren't even in the right places.

If you need to make triangles to get proper topology... do it IMO. Topology is the only thing people sees, not wireframe.

Its like the old polycount adage -- what's the better sphere? A 60-poly sphere, or a 500-poly banana...?