Ticktin also described where VMware Fusion 4 is faster than Parallels Desktop 7:
There are a handful of places where VMware Fusion consistently was faster than Parallels Desktop. For example, doing a full Shut Down of Windows 7 was faster in VMware Fusion. And, there were a couple of test configurations for File I/O tests and application launches that VMware was definitely faster, but Parallels was also faster in other instances of similar tests.
Overall, of the top-level tests, VMware Fusion won 7.8% of the tests by at least 10%. For the 3D tests, VMware Fusion never beat Parallels, but tied about 20% of the time. There's no doubt that VMware Fusion 4 is significantly better in graphics than version 3.1, but it still has not caught up to Parallels Desktop.
MacTech also found that Parallels also used less battery power:
Parallels Desktop has new power management features that stretch your battery life. On the MacBook Pro, we saw about 25% more battery time on an idling virtual machine (which results in 81 additional minutes of use) than we did on VMware Fusion in the same test.
Ticklin is careful to note that MacTech did not consider the features or ease of use of the two programs:
To be clear, this article is not a product review; it's a benchmarking analysis. You should use it as part of your decision combined with other factors, such as product features, user interface, which OS you want to run, graphics capabilities and support to make your product choice.
You can read about the features of the two products in our First Look articles for Parallels Desktop 7 and VMware 4. Recently, Parallels added ability to run Windows 8 Developer Preview, a feature that VMware Fusion 4 always had.
MacTech has tested earlier versions of Parallels Desktop in VMware Fusion in the past, and Parallels has usually been faster in most tests. Parallels Desktop 7 and VMware Fusion 4 both shipped in September and were major updates for both products.
(Quoted text and graphic used with permission from MacTech.)