The Plus version has a few extra features compared to the basic version. You can check them below:
- 1,800+ effects, transitions and templates
- 24-track frame-accurate editing
- Live Screen Capture
- 3D import, editing and export
The only big difference compare to the basic version is that the Live Screen Capture is enhanced and offers additional features. It also has support for 3D object manipulation.
You can check the comparison between all versions using the following page: http://www.pinnaclesys.com/publicsite/us/products/studio/