I prefer either Parallels or VMWare over Virtual Box. Virtual Box is free though. But at 50 bucks, video acceleration is nice to have when working with graphics. So here are steps that work as of today to convert a Virtual Box VM to a VMWare VM. These steps are out there on the interwebs and they aren't difficult but I didn't find them in one place so hopefully this will help someone.
3. Run the OVF Tool on you .ova file (I'm on a Mac):
"/Applications/VMware OVF Tool/ovftool" --lax image.ova /Users/[username]/Downloads