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What's the framerate difference between the two? How about the low light performance of each sensor? I'm not familiar with that portion of the Canon line as it has been so long since I purchased a crop sensor camera, but those are the two key questions I would be asking for birds.
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7d mk2 is literally like a 1d with a crop sensor. It’s going to be built tough like a pro camera should be. It’s older than the 90d by 5ish years now, but can still perform. Low on the resolution compared to the 90d, but the auto focus system Is supposed to be a lot better on the 7d being a pro camera.
Imo it’s such a hard choice and you can’t go wrong with either, personally for me if it was a serious use camera and I was focused on only still photos the 7d might be my choice. Video needs or just Amateur/beginner everyday camera 90d, better video options, cheaper, WiFi, touch etc. touch/flip screen features are really nice - i couldn’t go back to buttons and a fixed screen.