1st, I've used both products for quite a while. I have VMware on my PC Laptop, and Parallels on my Mac Mini and Mac Air.
Now ... I am trying to consolidate all my testing and virtual work to my MacMini and I wonder if I should continue using Parallels or get VMware Fusion, for Mac.
The reason why I am asking is because on VMware, building a SQL Cluster it's relatively easy and works really good. I also believe there are "ready to use" appliances or SAN devices for a Cluster, while I do believe that's not true for Parallels.