For motorsports, I would lean to the 7DII. It really is quite a nice upgrade from the 7DI; and the ability to tweak the AF system to meet your specific needs instead of having 'just' AF is really nice. You can, even, customize your frame rates for each continuous shooting mode. So, you can have 'high speed' continuous set to the full 10fps; but, if something a little slower fits your style better, you can set it to anything slower as well. From there, normal continuous shooting can also be throttled commensurately. They're small-ish things, but they make the body a real nice piece of hardware to use once you have things set to "you".
The biggest selling points for the 80D (DPAF, tilt screen, etc) are great if you're shooting from a tripod/doing video; but, if you're shooting action and long lenses, I cannot envision the draw being there. Having come to the MkII from the Mki before it, and shooting birds/wildlife and occasional airshows I have yet to see any reason to change from the 7D yet.