Difference between `uiop/package:define-package` and `defpackage`?

UIOP's one has more clauses.

https://common-lisp.net/project/asdf/uiop.html#UIOP_002fPACKAGE

define-package supports the following keywords: use, shadow, shadowing-import-from, import-from, export, intern -- as per cl:defpackage.

those are the same ones. But the rest of the docstring introduces more of them: recycle, mix, reexport…

I have used reexport which makes the following easier: you don't want to fully use package A (for example, Alexandria). You want to import a couple symbols (easy, with import-from), and you also want to export them (easy too, with export). But in doing so, you had to write the symbols twice. reexport saves duplication.

I heard some complains that defpackage would fail to reload a package in some situations, and define-package worked fine, but I didn't encounter this situation.