Think of it as tools for the job, I wish there was a do everything 3dGraphics/Programing package out there (it would save me money :)  but until it comes along you will find yourself using all sorts of software.

As far as who software is better the answer is yes.

I use Carrara 5 Pro quite a bit as do I use Vue as do I use Mojoworld as do I .....

The question you should be asking is what can I do more with and my answer would be Carrara as it will do out/in door scenes, physics, modeling, animation and much more as it is a general purpose package.

Vue is a great product and will do most of what Carrara can do minus most of the modeling features, limited animation tools (not sure about version 6) and no built in physics but can be achieved with python scripts.

Ultimately the choice is yours, keep in mind that there will always be a gfx package that will do something’s better then others and the reverse is true as well.