The benefit of using Odoo's spreadsheets is  that it allows you to pull live information from different models in the database in different types of reports easily; pivot, grave, list view, etc...

In addition to that Odoo's spreadsheets has most if not all of the commonly used functionality that you would need, for example:

1. You can insert rows, columns, and cells:

2. You can insert multiple sheets:

3. You can insert and design charts:

4. You can insert Pivot tables:

5. You can upload images:

6. You can insert and design tables:

7. You can use formulas and functions:

8. You can inserts Links, Checkboxes, Dropdown Lists, and Comments:

9. You can do the regular formatting:

10. Create filters and share the spreadsheet:

11. You can insert information directly from different models and view: