I'm considering preordering either Vue 6 xStream  or Vue 6 Infinite.  
Vue 6 xStream enables Vue 6 scenes exported to Maya, 3DSMax, Lightwave and Cinema 4D and render scenes in these higher end 3D applications.
I'll invest in C4D in the near future (for modeling purpose), too. 

1. But how much better is the render engine of Cinema4D than Vue 6 Infinite's?
   If C4D's render engine is not significantly better and faster than Vue 6's, I will buy Vue 6 Infinite and import scenes/models from C4D and render in V6I instead.

2. According to the official e-on Web site, the download file of  Vue 6 xStream is 820MB in size, while Vue 6 Infinite is 890MB.   Why is it such difference?   Shouldn't the xStream file be larger than Infinite, since it's suppose to have more function/features?

Your inputs are much appreciated!