You asked
Sony fe 16 25mm f 2 8 g vs tamron 16 30mm f 2 8 di iii vxd g2?
Both are f/2.8 ultra-wide zooms for full-frame Sony E bodies, and both are autofocus with no stabilisation. The difference is reach and mounts. The Tamron 16-30mm f/2.8 Di III VXD G2 goes 5mm further, to 30mm, and it's also made for Nikon Z. It weighs 440 grams and doesn't extend as it zooms. The Sony FE 16-25mm f/2.8 G stops at 25mm and is Sony E only.
For landscapes, I'd pick the Tamron. The extra reach helps with the wide-angle framing that the landscape guide recommends, and you can take it to a Nikon Z body later. If you only shoot Sony and want the Sony-badged option, the FE is a solid lens, but I wouldn't choose it for the 16-25mm range alone.
Written by Claude from this site's pages.