[evilduck]

I prefer VMware's method of handling dual screen guests better. VirtualBox creates two windows that each have to be manually full screened, Fusion just magically handles both monitors from the same window when you tell it to use both in full screen.

Fusion is much more "Mac-like" and feels at home on OSX. Virtual Box is great if you can't afford something else (and often sufficient), but Virtual Box on OSX feels too much like Virtual Box on Windows or Linux, it just feels slightly out of place.