So this is what I have so far:
-very expensive, I do not think I will get my boss to transfer this much money to a company in the US
+easy to set up and maintain
+Git integration (useful for media wiki import)
-one man show
-no ETA for YubiKey support
-unknown how long it will be supported and maintained
-no media wiki import
-no YubiKey support with LDAP Auth
-needs many plugins to work correctly (as we need it)
-needs a Theme to look good
So far DokuWiki looks like the best option, but I still do not like the extension approach, since the whole installation can break in an update if the extension maintainer decides to stop maintaining the extension.
This is what happened to our current media wiki installation and it makes it very hard to update, since we need to rewrite the whole config.