Nikon Z6, the first generation Nikon Quan Huafu, has a relatively low pixel value. The shooting of still photos is relatively good, but the video performance is relatively weak.
Panasonic S 1 is the first L-mount Quan Huafu mirrorless camera launched after the establishment of Panasonic-Leica-Sigma Alliance. Its pixel value is similar to Nikon Z6, and it has L bayonet of bayonet Global Marathon League, so the video function is powerful.
Relatively speaking, the camera function alone, all three can be competent. If there is a high demand for video functions, regardless of the budget, Panasonic is the first choice, followed by Fuji, and finally Nikon.