Canon's EOS R5 and R6 are designed to act as mirrorless versions of the hugely popular EOS 5D and EOS 6D series of DSLRs. The relationship is very similar, with the R5 offering list of capabilities that will appeal to a variety of professional as well as enthusiast photographers. But the R6 offers a strong feature set in its own right.
The 6DII physically has a larger sensor than the 90D, but the 90D is higher resolution. The 6DII will give you better low-light results at higher-ISO because of it. The 90D will have significantly better Dynamic Range at base ISO until about ISO 640, which is where the 6DII will take the lead.
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canon 90d vs canon r5