1. VMware Fusion is very fast and reported the highest benchmark ranking.
2. More of a technical interface rather than the attractive looks of Parallels.
3. I didn't notice any performance difference between Fusion and Parallels while running a VM of Windows 8.
4. Allows you to run your Windows programs within OS X.
5. Solid integration between the two operating systems, including conveniences one would expect like clipboard sharing, drag-and-drop, the ability to launch Windows programs from the dock, etc. Easy to share files between the two.
6. Handy wizard lets you migrate your existing PC over to a virtual machine for use inside of VMware Fusion, which can be great for new Mac converts who are still nervous about leaving Windows behind.
7. Pricing is also cheaper than Parallels, and for personal (non-commercial) users, the license extends to however many Macs you own.
8. The ability to run and test out multiple Operating Systems and tools from one workstation.
1. Doesn't look nearly as good as Parallels.
2. Performance is solid, but still somewhat reduced by the virtualization of the guest OS.
3. Requires plenty of RAM, and since newer Macs cannot be upgraded, make sure you plan ahead in this department when buying hardware. Also, you will need a Windows operating system license, which will raise the cost of this solution.
4. Resource limitations to run some multiple Operating Systems can be too intense for a basic workstation.
1. If you are a light user just looking to virtualize Windows, get Parallels.
2. It's a tough call between Parallels and Fusion but in my experience Fusion is a tad more stable and easier to use but both products are excellent. Checkout the list of features and there are some unique features for each product.
3. Just be wary when deploying this to a group, administration of this software in on a user by user basis. There is no central management as in VDI or VCenter which makes administration more tedious.
1. The development team being supported needed ways to test out different version of java, browsers, etc before they deployed their builds. Fusion allowed the Mac users to test on their workstation also.