Parallels / VMWare / Virtualbox

[Hades]

Is there any significant reason why I'd want to run Parallels or VMWare over Virtualbox, considering that VB is free? I've been using VB on a Windows machine for some time and am very familiar with it.

 

[Hades]

Is Parallels as fast as Bootcamp?

 

[Hades]

Thanks so far.

The Macbook I'm getting isn't really powerful enough for gaming so I will be keeping my gaming PC too. Virtualbox has supported 'seamless mode' for quite a few years which sounds similar to the coherence/unity mode for Parallelis/VMWare.