Deploying on Heroku with Capistrano?
Heroku uses Git for deployment, and is not capistrano friendly. In fact, the philosophy itself is different - Heroku does not have 'servers' where you can SSH to, or customize server to your need.
Heroku uses Dynos, which are predefined instances, with specific deployment architecture which covers majority of Rails deployment needs. You can do actions like Rollbacks, backups, migrations etc with Heroku, in some cases, more sophisticated than normal capistrano scripts.
Unless your setup is quite different, you can safely use Heroku for Rails (with only Git, of course) . If not, AWS is better bet.