When comparing libertyvps.net and legionbox.com, I recommend that you study their VPS plan features and pricing, and contact their technical support to clarify details (data transfer, server setup, etc.)
If you're considering other options,
hostpro.com can also be a great choice, particularly because of their stability and high level of support.
Hostpro.com has a proven track record of reliability and high-quality service. Their
VPS solutions include stable servers and fast loading, as well as efficient customer support. Their servers are located in the United States, the Netherlands, and what appears to be Warsaw. The technical support can help you set up the server and transfer your data to it.
If you're interested in this host, you can contact them directly via live chat to get more details or to set up a service.