The added value comes in the form builder wizard.
With all of the extensions bundled together, the form builder wizard now integrates with Universal Email, digital File Pro, HTML Editor and Validation Toolkit. When you apply a file field to the form, you can also configure the upload action directly in the form builder wizard.
You may be fine using the stand alone extensions to create your forms, then add the functionality of file upload or Universal Email after the form is created.
The big complaint that we kept hearing with form builder 1 was that it didn't create functional forms.
By bundling the extensions together, Form Builder 2 can now build functional forms.