DraftSight is an equivalent to Autocad, which is ideal for 2D architectural drawing.
SolidEdge is a 3D software that competes with SolidWorks; not specially adapted to the building. For architecture-oriented 3D, see software like Revit or Archicad.
I don't really want to get into 3D. I'm too used to "seeing" in 3D, from plans and sections. Later, perhaps.
Solid Edge 2D is also in 2D.
For the bugs, I didn't understand the first two times, I was rummaging around a bit to see what is possible and the system froze. No more response to orders and therefore the obligation to restart the program.
The third time, I wanted to see if there was a way to take a field plan received in PDF from "Object Insertion", to put it in the background of the drawing. Then the computer started pedaling without any more response. I also had to turn off and restart. The second time, no more problems with integration, but I didn't know how to do anything with it; I couldn't draw on top of the image in the PDF
if you have some 20 years of work on the board as I understood it
Whether you want layers the autocad base is quite advisable the majority of construction companies use the autocad base, and where http://www.nemetschek-allplan.fr/
Draft Sight is I think the closest to your expectations
I started to test solid edge but my preference remains on Draftsight. For the crash as soon as you start inserting, depending on the file size, you still need a machine that pedals a little. Not a work station but a machine with ram and a good processor it helps.
My last positive point for draft remains the use on windows or mac
For your information my tests pc intel P4 3Ghz and 2GB ram, I have small crashes on the latest draft releases.
Solid Edge 2D is not bad as a 2D design tool but it goes much less far than Draftsight in the management of layers, which is very useful in architecture. In addition, it is much easier to find skills (and therefore help) on Draftsight than on SolidEdge! I'll go more towards Draftsight...