I have just installed Acrobat DC along side Acrobat XI for trial.
Which version of PDFmaker am I'm running now?
The DC version or the XI version?
Very hard to say. Adobe do not support, and strongly discourage, using multiple versions. They try very hard to uninstall one if you install the other, so it's anyone's guess what you have...
When installing DC I got a checkbox whether or not I wanted to keep the XI installation.
Sorry for the delay in response.
As you have mentioned that you have both the version Adobe Acrobat XI and the Acrobat DC.
The PDF maker that will be installed is the latest version available in this case.
However as mentioned by TestScreenName above, it is always suggested to use the latest version of the application.
Let us know if you have any questions or need any help.