It’s a hard question for new enthusiastic users. In terms of video performance, the mid-range full frame mirrorless camera outshines the Nikon Z7 and similar to Sony a7 III. See here : Nikon Z6 4K video bartage similar to Sony A7 III
The _Nikon Z6_ is the high-speed, low-light version of the Z7. The full-frame mirrorless camera aimed at enthusiasts, featuring 24 Megapixels, built-in stabilisation, 273 embedded AF points.