Export Widget helps you to use the ready-made widgets in new/existing sites.
While you export the demo data, it exports the media files associated with posts and pages.
Advanced Export will export all the necessary pages you created.
Plugin will export existing posts along with its media files.
Advanced Export will export all the settings of the customizer and also options setting of plugins.
You have option of exporting either posts only, pages only, or products only.
It will export Taxonomies (Categories, Tags) settings.
It will export Metadata (posts, users, comments).
Advanced Export is designed specially for EASY, EFFECTIVE and FAST demo data export for WordPress. It can also be used for migration purpose. .