I've made a review about the Mavic Air, testing different Quickshoots, APAS and Cinematic modes ; but also all the resolutions and framerates available in video. It was quiet a surprise for me to find that there is a crop factor for every video with a framerate of more than 30fps ! Indeed, in with framerates ≤ 30 fps you have of field of view of 24mm, while with >30fps you have more something like 28mm.
You can see it here at 21:34 :
Then my question is : what do you prefer, wider field of view or faster FPS ? to me is field of view but I'm curious !