CamTwist doesn't have an Encoder.
It doesn't offer everything I need. Desktop Presenter is one example of a key Wirecast features that sends Video and Audio over LAN to Wirecast.
I use CamTwist often . . . as a camera source into Wirecast.
I like CamTwist. It's not a replacement for Wirecast though. It works with Wirecast. I use both together.