The Canon EOS 90D and Nikon D780 are two of the most popular Digital SLR Cameras for serious photographers. Not only do they have a wide range of features and capabilities, but they produce excellent image quality. The Canon EOS 90D has a maximum resolution of 32 MP, whereas the Nikon D780 has a maximum resolution of 24MP. In terms of ISO range, the Canon EOS 90D has a native ISO range of 100-25600, while the Nikon D780 has a native ISO range of 100-51200. The Canon EOS 90D has a maximum burst rate of 10 fps, while the Nikon D780 has a maximum burst rate of 7 fps. The Canon EOS 90D is more tailored towards capturing fast-moving subjects like wildlife and athletes, while the Nikon D780 has a more refined optimization in terms of video quality and has 4K capability. The Canon EOS 90D has a fully articulated touchscreen which makes it great for vlogging, and for capturing unique angles. The Nikon D780 has the same 0.39-type electronic viewfinder as in the Nikon D850, while the Canon EOS 90D does not have an electronic viewfinder. When it comes to autofocus, the Canon EOS 90D has 45 autofocus points, while the Nikon D780 has 273 autofocus points. The Canon EOS 90D has Wi-Fi and Bluetooth capability, while the Nikon D780 has Bluetooth only. Both cameras have full HD recording capability with no video time limit. In the end, it depends on what kind of photography you are into and the features you need. The Nikon D780 is the winner in terms of resolution, autofocus points, and ISO range, while the Canon EOS 90D is the winner in terms of burst rate, touchscreen capability, and Wi-Fi support.
It is hard to say which of the two cameras is the best as they both bring something unique to the table, and it is ultimately up to you to decide which one is right for you.