If you have a Rails App, you should consider Ninefold.com. You deploy direct from Github (or your Git Repo) and can have a VPS in the same security group if you need a utility box.
Depends on your use case. Advantage is around performance, and that you don't have to focus on the devops part of deployments that Capistrano requires. You get full access to servers & free SSL for rails apps. Strong engineering support.