One of my biggest pet peeves with VMware VCenter and Hyper-V VMM (Virtual Machine Manager) is the remote console feature of the virtual machines. Often, there is some underlying reason (Java, HTML5, Flash, etc) that the remote console does not work. With Citrix's XenServer, I have never had that issue. No matter what endpoint I install the XenCenter client on, it just works. That's a huge relief when providing remote assistance for customers who have XenServer. I know that I'll be able to get to the virtual machines.
