In general, the core features of functional testing are present in both the VS plugin and Test Studio Standalone: recording tests, test maintenance, quick execution and test lists. However, there are advantages to both: the VS plugin allows powerful debugging, while Test Studio Standalone implements load testing, test scheduling and performance testing. Since the full license for Test Studio includes both the VS Plugin and Test Studio Standalone, you won't have to choose between them.
The VS Plugin and Test Studio Standalone produce the same files, so you can move between editing a project with either client. Please let us know if we can assist you further.
All the best,
the Telerik team