It is, really, a ONE FREAKING HARD choice, lol.
Color wise, it's just not Canon. right? But...for all the other options (gh5s, a7iii), is the most comfortable one to pair.
There are a lot of things to put in the balance from each one and actually I'm having problem to balance the weight of each thing.
From Canon I have the advantage to have some good glass already, some minor detail like same battery (actually how's the battery performance in the eos r?) and easier worflow using my 80d as the camera that will remain here. AF, flipscreen and all those tools that I'm used too when I need. Like, I barely use AF but when I'm doing a one man job it really save your ass and you can 'relly' on that, rather than the not to close X-T3 that is good, but it's enough?
From what I'm seeing too, the fuji lens lineup isn't too great quality wise, I don't know. Maybe it's just that feeling that Fuji NEVER was a choice and it's probably their second real video oriented camera and you just don't have the guts to jump in the entire system.
Cameras are evolving really quickly and I have the feeling that we are changing the bodies more often than before, so, the price for the sell an used equipment, thinking about investment retain, is something is in my mind a lot, because quite frankly, we know that EOS R is just a sample for the pro body to come.
But then again, X-T3 too. And which of the two will retain its value for longer? Probably I already know the answer.