iPad face-off: Microsoft Office vs. Apple iWork vs. Google Apps

The other shoe has dropped: Apple recently revised its iWork productivity suite (Pages, Numbers, and Keynote) to take advantage of the split-screen multitasking introduced in iOS 9 for select iPad models. Microsoft had done the same several weeks earlier in its Office 365 productivity suite (Word, Excel, and PowerPoint).
iWork has added sharing support for Android users, but they can only view shared documents. Shared iWork documents can be edited only in a Windows PC or Mac browser, or in iOS