Which is better, 6d, 7d2 or 80d?

Generally speaking, it mainly depends on what kind of subject matter you need to shoot. 6d is the fuselage of Quan Huafu, and the picture quality is definitely the best of the three, and definitely the best of the three girls. But the fuselage is also the oldest, generally in the second-hand market, the focus is on the weakest of the three. 7d2 is a sports machine, a bird-shooting machine, and focusing is the best of the three, depending on whether you have any shooting needs in this area, while 80d is more comprehensive, so you can take photos and watch videos. Another important point is that Quan Huafu's lens can also use residual frames, but first of all, we should pay attention to the focal length equivalent to 1.6 times, and Quan Huafu's lens can also use residual frames, but it can only play 70% performance at most.