I've used both Parallels and Fusion since their first Betas, and I've found the performance of both to be very good. I used to use Virtual PC on my G4 machines, so I'm pleased as long as the VM runs at the same quantum level as bare metal -- which both Parallels and Fusion do.
My main concern -- far more important to me than speed -- is the integrity of the virtual machine and its interface with the host OS. That's the sort of comparison that I'm really interested in between Parallels and Fusion.
I've found the current versions of both VM products very stable, and very flexible. I've been using Vista for several months, and it has worked well with both Parallels and Fusion. I miss the Aero, though. I find much of the Vista interface overly complex and unintuitive. Just try finding where to click to shut down Vista.
My main concern -- far more important to me than speed -- is the integrity of the virtual machine and its interface with the host OS. That's the sort of comparison that I'm really interested in between Parallels and Fusion.
I've found the current versions of both VM products very stable, and very flexible. I've been using Vista for several months, and it has worked well with both Parallels and Fusion. I miss the Aero, though. I find much of the Vista interface overly complex and unintuitive. Just try finding where to click to shut down Vista.