The caption to the video says the two-seater J-20 looks more harmonious. Its functionality should be improved. The new Chinese fighter jet will be set to become the center of aerial control of drones in the future.
Recall that the single Chengdu J-20 made its first flight in 2011. It was commissioned in 2017. It is worth noting that some J-20s were fitted with Russian engines for the fourth generation AL-31FN fighters.