Blender and SH3D are very different. Blender is brilliant for making models: windows, doors, furniture, etc. For making a home - and for rendering complete, multi-model homes, SH3D is easier to work with. And with SH3D it is (relatively) easy to add extra model properties to windows/doors etc. so you can move and play in a scene without much editing.

So, I supoose the answer is both. At least for me it is.

ok