Virtuozzo Power Panel is certainly a better option in comparison to OpenVZ as it includes many features.
Difference between Virtuozzo Power Panel and OpenVZ.
What is Virtuozzo ?
Virtuozzo Power Panel also known as VZPP is used to manage a VPS efficiently. A user can Restart, Stop, Start, and Fast Stop his VPS when an emergency occurs.
Using Virtuozzo also helps a user to get better information of his VPS such as Change password, File Manager, Resources, System Services, System Processes, Firewall, SSH Connection, Status Changes, QoS Alerts, Action Log, Traffic Log etc.
What is OpenVZ ?
OpenVZ is basically a testing version of Virtuozzo that swsoft release to the public. It doesn't have as many features (such as advanced resource management) and doesn't have the Power Panel (which allows you to backup, restore, repair, reinstall, reboot). SW-Soft doesn’t provide support for it so if we get an advanced problem.
Hope this helps
