Vue currently has no displacement, so if that's one of your criteria, go with Carrara.  I have Vue5Inf and Carrara5Pro.  They're both great apps, but overall I'd probably say Carrara was a better choice.  The main things vue does better are plants and infine terrains.  Vue's plants really do look a lot more realistic.  Also Vue can do things like animate wind in the branches. 

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