IMHO, Carrara is like Bryce with built-in Modeler, DAZ Studio, Complete Plant Editor, Hair, and So Much Better with IBLs than Bryce. You can even use your Bryce IBLs (HDRI) in Carrara, but you can not use a standard HDRI (Non-Light-Probe) in Bryce. So where you begin to be limited in Bryce, Carrara will take you so much further down the road. 
Carrara is not just a better app, it is a Far Superior Piece of Programming!!!!!

I would rather be Politically Incorrect,
Then have Politically Correct-Incorrectness!!!