I can appreciate that they are different tools, but to accept your challenge, I submit three.js, along with the multiple websites that have boatloads of single feature demos. In the particular venue of 3D graphics in the browser, I contend three.js would provide more depth than anvil's breadth.
That being said, I see no reason why you couldn't combine the two, and get the best of both worlds.
That being said, I see no reason why you couldn't combine the two, and get the best of both worlds.