Thank you for your interest!
Test Studio Ultimate
is a standalone tool which provides the full functionality for automation testing. You could download a 30 days trial to explore its full functionality. In case of any questions you will be also entitled to submit support tickets during the trial period.
Test Studio Dev Edition
is a plugin for Visual Studio and exposes the basic functionality of Test Studio to record and execute automation tests for web and wpf applications.
I hope this information will be helpful to you. Though if you have any questions in regards both products I will be glad to share further details! Thanks!