Hi,
As far as I understand Kleopatra also manages certificates, but Kgpg
might have more functionality wrt GPG.
Kleopatra is a full feature GPG frontend ( including X.509/SMIME support). It has a lot users, as it is the key management software, the is shipped within gpg4win [0]. It has features like smart card management... g10code (the
company around GnuPG) also pays to develop Kleopatra.
Kgpg nowaday shares a lot libraries with kleopatra, that made Kgpg better and less broken;) Kgpg is a simple application, where you can do only simple operations with only GPG keys. I don't expect any feature of Kgpg that is not doable with Kleopatra. Additionally there is no real active development going on (nearly 100% is only cleanup - no new features, a few bug fixes)...
https://invent.kde.org/utilities/kgpg/activity
in contrast to:
https://invent.kde.org/utilities/kgpg/activity
I would encourage you to use Kleopatra as it has a far bigger user community and has active development. But on the other side you can use Kleopatra and Kgpg along side each other - as they are using the same data storage from GnuPG. So you can install both and use whatever matches for one operation the best for you.
Regards,
sandro
[0]
https://www.gpg4win.de/index.html
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