So to be clear, the official Blender FBX addon is not using the Autodesk SDK.  Blender Foundation has basically reverse-engineered the FBX format because of the GPL licensing limitations.  The Better FBX addon, however, may be doing something different there.  I don't know.  I think they're doing it the same way Blender Foundation does it, except they're also incorporating more features that are useful to game developers and people who depend on the rigging and animation functions that FBX is most used for.

The default Blender FBX export has a very useful feature that will allow you to embed all textures into the models upon export so that you never really have to worry about file paths.  If you pick "Path Mode > Copy" and then press the icon next to the drop-down box, it will enable "Embed Mode".  This will ensure that all the textures in your selected objects will be exported with their textures in the exported files.  Whenever someone opens that FBX file, it will automatically extract those textures into the same folder as the FBX.  This means no more "missing texture" errors in other apps.  I don't know if Poser or Daz offer that feature, but it's extremely handy if you have textures located in many different directories on your drive.

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