Re: happy citrix customer here
First, I agree that NetScaler remains best of breed. Spinning off that business (as Elliot Mgmt has recommended) doesn't make sense in that case.
With respect to your comment, "Citrix has for a long time been very honest that Xen is not as good as VMware," however, I respectfully disagree. I think you may be confusing the Citrix's hypervisor product (XenServer, which plays third fiddle to ESX and Hyper-V, a fact that Citrix makes no attempt to hide) with their VDI & application hosting products (XenDesktop and XenApp, respectively). I doubt you'll catch a Citrix sales rep stating that VMware's Horizon is superior to XenDesktop.