Men this post is a Lost point... Carrara its a full 3D software where you can model, texture, animate and render. Poser is like Daz Studio, only a composite tool for content and Vue is another tool to create Landscape animations that support content.
This is why Carrara isnt Poser and isnt Vue, it have the best of all  those worlds, its not perfect but I never buyed a box of pencil that could paint great images without a good artist.
The way out? Just get the demo version from all those softwares and try for your self, thats is the right way to choose a software. Theother way to choose is to look what your target want you use, like CG houses, game development industry... if your idea i to be a pro lookswhat they want you use... other way try demo versions.
I did this about 3 years ago and find Carrara as a perfect tool for me, there a lot of things that need to be done so it get perfect (never will like all 3d software), but it can handle Poser content, have some cool tools to landscape, can model (some model fuctions can be animated!!) andhave a great render engine, faster then Poser and Vue.

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