You asked
Nikon af s 16 35mm f 4g ed vr vs tamron sp 15 30mm f 2 8 di vc usd?
The Nikon AF-S 16-35mm f/4G ED VR is the lighter, cheaper choice. It's a Nikon F lens that's stabilised and autofocuses, and on a full-frame Nikon it frames as marked, 16-35mm. Since most landscape work happens between f/8 and f/11 anyway, the f/4 aperture costs you very little, so for Nikon landscapes it's a sensible pick.
The Tamron SP 15-30mm f/2.8 Di VC USD gives you a wider view at 15mm and a brighter f/2.8 maximum aperture, which helps in dim interiors or for night work. It's also stabilised and autofocuses, and it mounts on both Canon EF and Nikon F, so it suits a visitor who might switch systems. Read the Tamron's page for the full list of bodies it fits.
If you shoot landscapes, the landscape guide explains why f/4 zooms are often the better buy. For third-party lenses in general, see the lens guide.
Written by Claude from this site's pages.