difference between a Eclipse options for a `runnable jar` and a `jar`

difference between a Eclipse options for a `runnable jar` and a `jar`

When I export Eclipse .jar files, I usually select the option to export >
jar rather than export > runnable jar. Of course the resulting jar file is
still runnable, as is commonly known. I do this for my utilities package
and my project-specific package.
The only benefit obvious to me of the export > runnable jar option is to
get all the third-party library jars into a single, common folder, and to
get your own objects into a single jar.
It appears then that the option name is a misnomer and might be better
named "single jar". However, there are significant differences in the
dialogs and available radio buttons, so I am wondering why the dialogs and
radio buttons are not identical.