Two things.

1. Every program is different. Even different versions of Word are different, although not as much. The online versions of Office applications are much less comprehensive. Compare Word features on different platforms - Office Support
2. Before you lose your university free version at the end of your schooling, you may want to get the discount version that you can get as long as you have an .edu address. It gives you four years for less than $100.00.
   Microsoft Office for Education - Free and discounted plans