OnlyOffice has been working fine for me though I’ve not used it in serious capacity.

I initially started with Collabora but for some reason I couldn’t get it working. This is surely not an issue with the product though and entirely my fault.

Are either of those brands designed with the same level of user serviceability in mind?

The main drive for framework is how easy they are to repair or mod along with their varying degrees of modularity (such as their swappable ports).