Now the smaller model on the left, was done in another app and imported into Cararra, the problem with the smaller model on the left is, that it has too many polygons, as stated previously.  I plan to have more objects in the scene and animate them, so I need the scene to be more compact and less polygons, but yet look more decent than it does now.

Especially the middle rectangular object, you notice it looks more defined in the smaller model and looks more rounded in the Vertex Model.