You may have seen my article on my news feed where I compare the three devices going by what I know now. That's actually an evolving document as I learn things about the Mate 20 Pro.
Today, for example, I've just been to the gym and learnt that a) the fingerprint sensor can be a bit annoying if you want to unlock quickly, as you have to guess where to press and b) the RAM management appears to be far too aggressive, shutting down my fitness tracking apps.