There is a difference between "cloud-hosting" (= storing your documents on other people's computers) and "collaborative editing" (= working on the same file at the same time).
However, in direct comparison with SoftMaker Office (which, admittedly, is not free software), LibreOffice is inconsistent, sluggish, unstable and less compatible with Microsoft formats.
Depends on the task. SVN or Fossil (if you need a web interface) for cathedral-style, Mercurial for bazaar-style, I’d say. Especially because of their easy to understand UX.
There is a difference between "cloud-hosting" (= storing your documents on other people's computers) and "collaborative editing" (= working on the same file at the same time).