I use only two programs on Windows. The first, Autodesk Revit Architecture is mission critical, and if Im going to be using it for a power session I will probably be booting up in Windows only. Even on a fast and powerful 8 core Xeon windows tower I often struggle with speed issues when the files get large. The second is the ancient but amazing DVDdecrypter. This is a program that I would use a lot more if I didn't have to change back and forth, but not critical. Basically, for Revit would I get better performance results with VMWare or Parallels? Am I correct to assume both give me the same functionality of opening windows files on my mac, and opening my mac files on windows, or at least being able to copy them across without hassle, i.e. drag and drop or copy paste files.