Weycrest, a competitively priced hosting company in the UK, gets asked the question quite often, "what's the difference between OpenVZ and Virtuozzo?".  In a recent blog post, they attempt to answer that question, as follows:

OpenVZ is very much a stripped down development platform, albeit a very usable and robust one. Here are the main differences:

• Greater VPS density - Virtuozzo due to its memory and file sharing capabilities enables higher number of VPS’s and better performance of VPSs. Basically more VPS’s per server.
• Management Tools & GUI’s - Virtuozzo is supplied with management, monitoring, troubleshooting, and admin tools which can significantly reduce management, administration, and deployment costs. These include VZPP, VZCC, VZMC
• Command Line Utilities - Virtuozzo ships with a number of additional command line utilities such as vzstat, to assist the management of the VPS’s and hardware node.
• Support and Maintenance - Virtuozzo™ being a commercial product supported and maintained by SWsoft (though SWSoft also offer paid support for OpenVZ).
• Virtuozzo ships with advanced recovery, monitoring, and Back-up tools. With OpenVZ these are supplied by the development community.
• Virtuozzo has additional support for physical to VPS and VPS to physical migration tools. These tools allow trivial conversion of existing physical servers into Virtuozzo™ VPS (and vice-versa) to create a virtualized infrastructure.
• Virtuozzo ships with additional traffic accounting tools for bandwidth management and control for individual VPSs in addition to aiding the security of VPSs running on the same host.
• Virtuozzo offers greater integration with the Plesk Control Panel, with discounts on Plesk licences

So the VPS end user might not notice a big difference between a Virtuozzo and OpenVZ from the “inside” apart from the lack of an “offline” control panel to manage the VPS.

The original posting from Weycrest is found here.