They're some brilliant Bryce artist that can wring the most out of Bryce. I've seen some amazing images done with that program. I started with Bryce 3d and worked my way up to B6 and by this time I can do some awsome chrome balls in space.

Cararra seems to needs a rock maker. The trees look much better but still could use some improvement.

I chose Carrara 'cause a friend gave me a bootleged copy of C1 and it got me interested and I bought C3 and have worked my way up and the program keeps getting more interesting.
The other 2 reasons I went Carrara was it was cheaper then the big boys and still have several video tutorial training programs on using these programs...