There are more pros than cons in Office 365. Below are some upsides which I find most helpful about Office 365:
1. Office 365 Suite comes with Onedrivve, Sharepoint, Word, Excel, Powerpoint, Access, Forms, Outlook, and many other amazing business applications.
2. Integration if the applications which come with O365 is very smooth and hastle free.
3. You can access Ofiice 365 with many devices like computers, laptops, Mobile Phones, Tablets, etc.
4. The most amazing thing about Office 365 is that it comes up with desktop as well as web applications depending on your license
5. You get advance threat protection
6. Multiple people can work together on the same task using Office 365
7. Autosave option to save the files automatically in onedrive
8. You could recover not saved files using apps like word, excel, powerpoint, etc Review collected by and hosted on G2.com.