What is the difference between the two versions of KeePassXC in the Ubuntu Software Center?

I'm trying to figure out which KeePass version I should install. Ubuntu Software Center doesn't make the choice any more easier.

In the description of KeePassX, it says (emphasis added):

In contrast to KeePassXC (package keepassxc), the development pace of KeePassX has slowed down. It has less features, and uses an outdated version of the Qt widget. If you do not know whether you should install keepassx or keepassxc, install keepassx instead!

Wait, what?? KeePassX is fading out, has less features and is built on outdated technology, so you should use that? Well, I think I would rather choose a package that is more actively developed, has more features and is built on modern tech.

However, there seems to be two versions of KeePassXC in the Software Center:

• 2.6.6 (151 reviews): "Modern, secure, and cross-platform password manager compatible with KeePass"
• 2.6.6+dfsg.1-1~exp1 (169 reviews): "Community-driven port of the Windows application “KeePass Password Safe”"

Now, what is the practical difference between the two versions of KeePassXC, and are there really some reasons to prefer KeePassX instead?

I'm grateful for all the help. Trying out the different versions would be quite an undertaking, as there are plenty of relevant use-cases across different platforms.

Solution 1:

The difference between the two KeePassXC versions is essentially their version number. You see two versions, because KeePassXC is available in two different package formats, as a traditional .deb package from the Ubuntu software sources and as a Snap package. Typically, the Snap version will be newer than the .deb package. This question outlines a few of the pros and cons of each format.