One of the advantages of a VPS is that up- and downgrades can be performed on the fly. And you can reload whatever OS you like whenever you want from your VPS control panel.
Due to the nature of VPS, the price should be much lower even with the same level of support and management. We monitor all containers *all the time* to keep our master nodes fast and stable. Here's a nice article on the differences between the two VPS virtualization platforms we offer:
https://secure.xenlayer.com/index.ph...openvz-and-xen