A:Answer Please read this and you may have a better idea about what you will buy.
https://www.techradar.com/news/best-mirrorless-camera
I had a hard time to decide between Sony and Nikon and just bought Nikon Z6 based on overall factors including the time of it release, cost, functions including IS, photo quality, and hand-hold, etc. I tried Sony found the following: Cost is high, hand-hold-too small for my hands, it is two years old but its auto focus is better than Nikon Z6 that has better video and very nice photo quality. Canon is out of my consideration because it lacks the image stabilization-IS, video crop affecting the video quality and price is high. Good luck!