Just like the recession, it's official. I'm totally hooked on OpenVZ and here are the reasons.
- Performance, performance, performance. IO-intensive apps are really sluggish on VMWare. I have OpenVZ running quite nicely on an old AMDK7. I had two VE's running (one with Security Center managing a Nessus scan, in progress) and other Ubuntu server and I was playing a game of Netpanzer with my son with no issues. Now that is a benchmark.
- Ease of use and broad Linux distribution support. Debian 4.0r3 slightly edges out Ubuntu 188.8.131.52 and it looks like CentOS (as the host) is straightforward as well. There is also a rich library of Linux OS templates to choose from.
- Non-Disruptiveness - a lot of Linux other virtualization solutions don't play well with others. VirtualBox doesn't work if kvm is running. Hell, I've yet to find a Linux distribution where Xen works out of the box, but on Ubuntu I can have VMware Server and OpenVZ together with no issues.