if you do houses - static models - that SU is the way to go.
Simply because Blender does not have any way the tools SU
has such as module libraries and placing windows on a wall while
instantly also cutting into the wall the hole for the insert.
The boolean tool in Blender is rather slow and for such things it
never worked for me.
If you need organic forms SU is not the way to go. Some people do
product sketches with SU but well I see that more as a waste of time.
SU is made for architecture and thats it.
But for rendering, scene enhancements like particles etc texturing
and rendering or animation you can export SU into mesh and import
it into Blender.