These are solving two different problems. webRTC.io looks like it does a great job of abstracting webRTC on the client side to make it easier to build your app

These are solving two different problems. webRTC.io looks like it does a great job of abstracting webRTC on the client side to make it easier to build your app on top of it. TokBox is an end-to-end video chat solution that happens to support webRTC. They are abstracting both the client and the server here.