I think strictly speaking DXF is more transferable than DWG (but most programmes are ok with DWG).
I also had a weird thing recently where it turned out that using "AutoCAD Architect" or something was really messing up the transferability of my files (even exporting to old formats). Plain AutoCAD was fine.
Is DXF only for 2D drawings? What we ideally need to be able to do is generate sections, which I understood required 3D models (but I have virtually no knowledge on this).
I've only used DXF for 2D and only then for transferring files, I think it probably does 3D data and DWG definitely does. If you are "generating" sections from a 3D model it would have another format. But you can (people still do) draw plans and sections as 2D CAD drawings (3D model not required).
I think strictly speaking DXF is more transferable than DWG (but most programmes are ok with DWG).
I also had a weird thing recently where it turned out that using "AutoCAD Architect" or something was really messing up the transferability of my files (even exporting to old formats). Plain AutoCAD was fine.