"Best" ? .. hee hee, thats kind of subjective, but I doubt it would start a flame war like asking that the 'best' OS is.
SW maps best to .DWG files, dimensions aligned non-orthagonally to .DXF can come thru 'funny.
If you have to export dxf's, see if you can export version 13 or later. One way to see, would be to export a simple rectangle (polyline) from acad as ver 13 or newer, and see if it shows up with their importer.
If you *have* to export acad r12 or earlier dxfs, you're pretty much gonna have to stick with plain vanilla text.
Most important, make yourself up a MAP file for sw --> acad
If you can export v13 or newer, use "TrueType" fonts and SW line types.