"*Found one thing that Bryce can do that Carrara can't. Animate terrain deformation. So for animating hills/mountains that grow or erode over time, Bryce has a small edge there. (Might be able to do something to a smaller degree with an animated material displacement, but I'm not sure it'd be close to the same degree that a terrain would displace.)"

*I noticed that right off, since I've used  terrain animation a lot in Bryce. I've made a lot of Grayscale animations in Bryce to import into Carrara to use as an animated displacement map. Works great, and since it's grayscale a 5 second, 30 fps clip will render in about 5-6 minutes!  I've made roaring rivers, mudslides, and lava flows in Carrara thanks to Bryce's ability to animate terrains.

P.S.- I'm looking forward to seeing Severed's finished render.