I work remotely for my job. I do travel several times a year as a result and when I'm gone I have other family members watch my house. Before 1Password Families I had to find a way to easily get my wifi password, my garage door code, and various other instructions and information to whoever was watching my house.
With 1Password Families I simply create a vault in my Family, add my items to it and invite the person who will be watching my house as a guest (or in my most recent case, granted my brother access to the vault).
In the first case, the person simply signed up, installed 1Password and they had access to the data. In the second case, my brother simply unlocked 1Password and the vault was there.
When I get back home, I simply remove access and those things disappear from their devices. None of these are so important that I have to change them, but, that's another step as well if necessary.
But that is how easy it is to share and use vaults in 1Password Families (and Teams).
I also love that using this I can add family members, like my parents, and it handles all the syncing for them so I don't have to micro manage it with backups and other stuff. It's a far more seamless experience. And since I hold the keys to the family kingdom, I can also reset their master password for them if they forget it.
Now, you might think you have no use for this, and that's fine, but it's an example of how someone who doesn't have an immediate family (I'm single, and childless) was able to use 1Password Families in a way that wasn't obvious when I first set out to use it for myself.
In terms of features that differentiate us from Keepass, I have never used Keepass so I am not able to speak to what we do differently. I'm sure there are things each of us do better though.
There is a trial version of 1Password, so, you could use it and see how it stacks up for yourself. I'd be very curious what you find better or worse so I can pass that feedback along to our team. Completely optional of course.
Kyle
AgileBits