If you're in the Apple ecosystem, file sharing through iCloud and the Apple quite of apps is pretty good (not quite as good as O365, but worlds better than Google Docs)

I have to disagree here. iCloud file sharing is atrociously bad. I share a fairly minimal amount of files with another apple account and there's constant sync issues, it's not anywhere near realtime or even "soon". Shared files and folders routinely never show up in iCloud drive even when they appear on the web interface. Restarts seem to be required to fix problems as they arise.

I've had nary an issue in the last several eyars since first trying it ... guess this may be a ymmv situation?