The last time I posted results was a few months ago. I’ve still been testing all three. Recently I completed network transfer tests. For these tests, I used Vista Ultimate SP1 with Parallels 3 and Fusion 2.
This time the MBP was configured with 4GB of RAM. I had 2GB allocated to the VM. Fusion had both cores selected, and Parallels was set to be optimized for the VM. I also disabled App Sharing in Parallels as it created massive performance issues in previous tests. I did not install MacFuse as Fusion prompted.