Link: http://hostingfu.com/article/xen-or-openvz

A very useful comparision detailing the differences with Xen and OpenVZ, especially when it comes to memory management .

While both Xen and OpenVZ are open source server virtualisation technology, there exists some big differences between the two. I think potential VPS customers might need to check the applications that need to be hosted to determine which one is the preferable virtualisation technology.