LOL, I have both. Vue6 infinity and C6pro. Each has its moments. I use Vue more. I can't stand modeling in Carrara. I'm spoiled, I use modo302.

The first thing I did in Carrara was my avitar. Carrara does have some good option like fire and particles that Vue does not have. This is why I have both.

As bwtr said, get the demos and see what YOU like better and has the Options that you can use the most. It really does not matter what we think. We can only give you our opinions and as you can see the first two replies are completely opposite of each other.