You asked
Nikon z 24 120mm f 4 s vs nikon z 24 105mm f 4 7 1?
Both are Nikon Z zooms for full frame, and both start at 24mm, but they differ in a few useful ways.
The Nikon Z 24-120mm f/4 S is the one I'd pick. It holds f/4 across the whole zoom range, and its extra reach to 120mm covers more of what you'd shoot. I think it's probably the best all-round zoom on Nikon full frame.
The Nikon Z 24-105mm f/4-7.1 is a lighter kit zoom. It gets darker as you zoom in, but it focuses closer at the long end, which helps with close subjects. Neither lens is stabilised, so for dim indoor shots, a stabilised camera body matters more.
If you want one zoom that covers most situations, go with the 24-120mm. The travel guide explains why a versatile zoom like this is so useful.
Written by Claude from this site's pages.