Within the Guest Operating System, using OpsMgr, you can see the same information about the OS and the application. In other words, if I use OpsMgr to monitor the health of a Guest OS, can see how it and the applications running within it are performing. On the other hand, with SCVMM I can see how a VM is performing (what type of utilization it is taking up), and I can use the Health and Performance Monitoring of OpsMgr to trend the performance of the overall systems. What I am trying to say is that when you use the entire Microsoft Virtualization System Center Suite of Tools, you can truly see what is going on from the physical hardware through the Virtualization Layer up and into the Guest. With VMware, you have insite into the Virtualization Layer, but limited up and down the stack.