You asked
Nikon z 70 200mm f 2 8 vr s vs tamron 70 180mm f 2 8?
I don't have a page for the Tamron 70-180mm f/2.8, so I can't compare it fairly against the Nikon. I'd rather not guess at its specs or price.
What I can tell you is that the Nikon Z 70-200mm f/2.8 VR S is a full-frame zoom that works on most Nikon Z bodies, including APS-C ones like the Z50. Its second version is about a quarter lighter, which matters if you carry it all day. If you want a closer Nikon alternative, the Nikon Z 70-180mm f/2.8 is worth a look.
Tamron makes good third-party lenses, but check that your body's autofocus features are supported and that Nikon's mount allows that lens. The third-party lenses guide covers both points. For portraits, a 70-200mm or 135mm gives you the flattering distance, as explained in the portrait lens notes.
Written by Claude from this site's pages.