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Try both out as flatpaks if you're on Linux and keep the one you like as I did :). I think both flatpaks come with the full suite.
I ended up sticking with OnlyOffice and feel it will probably work better for most people doing things like writing documents and spreadsheets with various formatting, tables, charts, formulas and equations.
I am mainly a Google docs user (and in the past MS office) as most people are and the OnlyOffice UI and workflow is much more comfortable if you're coming from these products. Things work and look the way you would expect. LibreOffice UI feels very clunky and dated (even after trying different layouts). For example, charts look really bad by default in LibreOffice. OnlyOffice seems to work pretty much just as well as gDocs/MS office so far in my limited experience for most scenarios.
As part of my effort to reduce reliance on gDocs I am planning on setting up a self hosted Nextcloud office instance and it is based on OnlyOffice so it is more motivation for me to stick with it!