You asked
Nikon af s 18 35mm f 3 5 4 5g ed vs sigma 12 24mm f 4 dg hsm art?
These two cover different ground. The Nikon AF-S 18-35mm f/3.5-4.5G ED is a small, inexpensive full-frame zoom for everyday shooting. It fits a long list of Nikon bodies, APS-C ones included, but it isn't stabilised and it gets darker as you zoom.
The Sigma 12-24mm f/4 DG HSM Art is the wide-angle choice. It reaches 12mm and holds f/4 across the whole zoom. It's made for both Canon EF and Nikon F, so it's the better pick if you might switch systems.
For landscapes and interiors on full frame, I'd take the Sigma. For a light, easy kit on a Nikon, the Nikon is the easier one to carry.
Written by Claude from this site's pages.