For me the comparison is render quality, & speed, but more important ( to me ) is set up time. After modeling the scene ( and creating the textures ) I imported them into the programs, set up camera angle and textures, then rendered. Well, Bryce does have the longest render time, but if I added set up time to it, Carrara takes the worst billing. It is so far the most user unfriendly program I used.

Stephen Ray