The best way to choose between various hosting services is to see which ones are suited to your requirements. If cost alone is a factor then none of the best vps web hosting schemes from any company can fit the bill because they are costly although not as expensive as dedicated schemes. Furthermore, if you are interested in heavy traffic then dedicated might be the way to go instead.
Understand that the vps services are more of an upgrade over shared environment and a downgrade from physical dedicated environment. While it has the advantages of a dedicated server it does have a few limitations that it borrows from shared environments such as the fact that the server is still prone to crashes because of severe hardware demand simply because of the large number of users piggy backing on the single system. One distinct advantage of vps over shared however is that the customizability of vps.