EOS R3

I have the r7 and use it for wildlife and I would gladly use a 39mp stacked sensor. For wildlife the camera readout speed matters a lot to minimize rolling shutter. If I can find a reasonably priced r3 in the future I would gladly pick it up. The readout speed of a stacked sensor is usually faster.

I like the cropping capabilities of the R5 and their use in studio work, but the large file sizes are mostly a hassle, and thus the reason I was interested in the R6's. file size isn't the priority, what you want is the best autofocus for sports, which always means fully stacked sensors, like the r3

Hope this helps! If it matters The r3 has a faster readout speed than the r5mk2 Here’s a pretty good comparison site https://www.cined.com/canon-eos-r3-lab-test-rolling-shutter-dynamic-range-and-latitude-test/ https://www.cined.com/canon-eos-r5-mark-ii-lab-test-rolling-shutter-dynamic-range-and-expo