Air 3 is great for night shots and wind conditions (like beach), but mini 4 is so quieter and more portable… I had a air2s and switched to mini 3 pro, but the difference in the beach was noticeable!! Any way, I changed my mini 3 to a mini 4. Even being inferior in the wind, the silence is primordial to me.
After reading a lot of comments. I can say that MP4 is for those who want a small compact drone in non-windy weather and can fly in more crowded places, as it makes fewer sounds. In turn, Air3 is suitable for those who want to shoot content more, in more windy weather and not in crowded places.
