In Parallels H-Sphere you can install VPS server based on FreeVPS or OpenVZ solution. If you already have a VPS logical server based on one of the solutions, starting with Parallels H-Sphere VPS 2.0 it is possible to switch to another solution in console or from Parallels H-Sphere Control Panel
Parallels H-Sphere users can easily switch from FreeVPS to OpenVZ (and vice versa) solution from their Control panel. For this: