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Unfortunately, I don't think either is particularly great. LibreOffice looks horrendous, performs at or below average, and does not have fabulous compatibility with Microsoft Office formats. On the other hand, ONLYOFFICE has better compatibility but feels cheap and pushes web services.
If this is for personal use, I would go with LibreOffice. If you need to share documents with others using a common format, go with ONLYOFFICE.
Both are good, but different focuses. OnlyOffice has fewer features, but extremely good MS Office cross-compatibility.
Libre Office has more features, but can run into compatibility issues when going back and forth between MS Office.
That being said, for the average user's needs, both are perfectly fine.
OnlyOffice is also able to be used in a cloud framework similar to Google docs, but to my knowledge Libre Office cannot do that.
I think Collabora Online uses or is built on LibreOffice. It's a subscription service but you can host it yourself for free (I think for personal use). I've not tried either. I'm pretty sure the Collabora team are big code contributors to LibreOffice. If I got anything wrong I hope someone will correct me.
Is it possible to download just the word processor (libreoffice's) and nothing else?
Like abiword? Depends what you need
Sorry. Im asking about word processor from libreoffice
Not that I’m aware of.
And LibreOffice
LibreOffice unless MS Office comparability is the most important thing. Then maybe try ONLYOFFICE.
libreoffice