I really don't see too many disadvantages to either platform other than the fact that you may have to take some time to explore and use tutorials to create documents, drawings, spreadsheets, etc. I think there are many advantages to these platforms:
* You can send people to a link of a document or presentation instead of having to remember to attach the document to an e-mail.
* Ease of use
* You don't have to spend outrageous amounts of money on Microsoft Office.
* People who don't have Microsoft Office (or maybe have outdated versions) can view your documents and presentations. This is especially helpful in my situation. Many of my students have a computer or access to a computer, but they do not all have the Microsoft Office suite, as it is very costly. They can create documents or view documents from me without having to purchase expensive software.