I know, Chromecast and Google TV are obviously two different products. They don't share the same features or functionality, and one can be wildly more expensive than the other. But they're also attempting to solve the same problem, albeit with competing philosophies. That problem? Making your TV smarter.
The Chromecast chooses to do this as a sort of 'bridge,' making your smartphone, tablet, or computer the control center for your TV, while the Chromecast itself just acts as a sort of facilitator for this process.