Nikon Z 6III vs Nikon D850

While one is mirrorless and the other is a DSLR, the Nikon Z 6III is a better overall camera than the Nikon D850—it's newer, which means it has all the benefits of newer camera tech, including a better processor, a faster readout speed, better high ISO performance, and more advanced autofocus and, especially, video features. It's also significantly more portable. Having said that, the D850 is one of the best cameras of its time, and its sensor has a higher dynamic range as well as a higher resolution, so if you don't mind a bulkier camera and don't need video features, it may offer better value, depending on the type of photography you do.