Canon - EOS R6 Mark II vs Sony - α9 III

These two are evenly matched on the broad strokes, with the decision sitting on which individual spec advantages weigh more for your use.

Pick the EOS R6 Mark II if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are af points, weight.

Pick the α9 III if you care most about max video. Its strongest claims are max video.

Both ship with comparable sensor size, megapixels, in-body stabilization, so those specs don't separate the two — focus on the differences below.

Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.