I'm not sure what you mean right now? DXF export works fine with illustrator. Inkscape is lousy with DXF. But DXF isn't good for illustrative stuff anyway, but rather for purely technical projects such as laser cutting, CNC or the likes. That's why DXF is really only good with lines only and not with "colored fills", but we added that option just in case someone really wanted it.
SVG works fine in both InkScape and Illustrator, while Illustrator needs the line width scale turned on and inkscape off.
...but they work fine.
So, I'm not sure, if I read that you do have troubles or not, it's a little unclear to me. If you have a software that doesn't properly import something, just let me know. If it is free (and not too big), I can have a look, of course.