ONLYOFFICE is less functional than Libre Office, but it is open source and has the following advantage I find useful: It opens all Microsoft Office .doc and .docx files with better fidelity than Libre Office does. Especially those with embedded vector graphics, which Libre sometimes screws up. The functionality is more like Google docs or something (e.g. no plugins, etc.). But it's good to have around.

Onlyoffice is realy promising and amazing piece of software. However, I find it to work really bad in (poor) machines with less RAM (4gb or less). Optimization is way worse than what a software with maturity as LibreOffice can get. Also, like what other people said here, LibreOffice have more features at all, it's a more mature and reliable project.

I like ONLY Office for simplicity and compatibility with Microsoft Document but if you need more functionnality Libre Office is a better choice.

good ms office alternative but free version has limits.

WPS has the following drawbacks: 1) The 'free' version doesn't let you print freely (ie without a watermark, if at all), 2) Unlike Libre Office, it doesn't integrate with many popular plugins, e.g. Zotero or Mendeley. 3) It's not open source and therefore, in contrast to what another comment here claims, you don't know what the code is doing, and you don't know if it's spying on you or not.

Worst point about WPS is that it 2019 version has a forced Chinese regional standards (decimal and thousand separator). WPS 2016 used to respect regional standards in latter versions, so as 2019 in very early versions. But since few years separators are now hardcoded.

High compatibility, small files, platform compatibility, stability, speed, low demand on resources.

Pretty similar to MS Office (uses the ribbon interface), very complete and powerful suite.

Easily the easist, fastest & best designed Office alternative, though it may lack some advanced functionality (I wouldn't know, as I primarily use it for standard, basic office suite use)

OpenOffice seems to be end-of-life. It doesn't receive as many code contributions as LibreOffice and has fewer features. LibreOffice is a successor to this project and is probably better for most users.

Lightweight and stability.

Actually, (Apache) OpenOffice was before LibreOffice. The macro's of LibreOffice run smoothly in OpenOffice, and even more fluently with less flickering on radeon graphic adaptors.