I sold my Canon gear and went full in on Fuji and so far I love it. I've even come back to PotN from a 6 year hiatus. Fuji is a creative experience vs a technical one, so if you're just as interested in specs as photography you'll probably be better off with Sony if you want to go mirrorless. Sony loves those paper spec sheets.
I tested the waters with an X-E3 and 35mmF2 and fell in love instantly. Then I got the X-H1 for IBIS/OIS combo and I'm regularly taking 1s photos hand-held without issue - and I have shaky hands. If not for IBIS I probably would have just gotten the X-T3 though. I can't recommend Fuji enough... unless you do sports, night, or wildlife photography. The fast lenses Fuji makes are great, but it's the sensor size that holds it back. Full frame camera's will have slightly better IQ/noise profiles. Not enough for me, but if you're going to do night venues I would probably stay with Canon and maybe get a Fuji for fun on the weekends. The X100F is a fantastic camera for that purpose. Tracking on the Fuji system is OK, and improved on the X-T3 over the other systems, but it misses more than Sony.
What makes Fuji different is the fit and feel of their cameras. They really are the new Leica. Fuji has made their limitations strengths. The Pro3 is an example of that philosophy. The Fuji menu system is odd and tedious, so SAVE your setups just in case your batteries run dry. It will take you a good week of tweaking, looking up menu names, and figuring out what's important for MyMenu, but thank goodness once you're done you don't have to mess with it again. For example, if you set your OVF to Natural you'll chew threw batteries fast because the camera will try to keep compensating light by changing the aperture until the very last millisecond when you release the shutter. That constant change is a power hog. Another example are grayed out menu items. It doesn't tell you why they are grayed out. This is one of the biggest issues with people's complaints and frustrations. But, this all serves to actually make you a better photographer because you have to learn why it's doing what it's doing. You'll know your camera better than you've probably ever have.
Good luck with your choice!