One other thing I like about Onedrive is that I share a lot of Word and Excel files with students as read only (grades, assignments etc.).
I can email or post a link and when they click on it, it will open in the Web version of office.
This is good for me because I know that the formatting etc. Will be ok.
When I tried using Google drive, it opens in Google docs on the Web, and if you have a large spreadsheet, it breaks it up into separate pages, and if you have multiple worksheets, you have to scroll through all of them, it doesn't present them as tabs.