Prime lens or zoom? Both the Nikon Z180-600mm f/5.6-6.3 VR and the Nikon Z600mm f/6.3 VR S are suitable for bird photography. But even if the speed and maximum focal length are the same, there are also significant differences. This video deals with handling, autofocus, price, image stabilizer and, of course, image quality.
You can buy both lenses here (Affiliate links):
Nikon Z600 f/6.3 PF: https://bhpho.to/47yjDG4
Nikkor Z180-600: https://adorama.rfvk.net/QyG3D3
Nikon Z9: https://bhpho.to/49YeGbe
Nikon 1.4x TC: https://bhpho.to/3sKX16d
Nikon 2x TC: https://bhpho.to/3RjZvSi
Get noise-free images:
DXO Pure Raw 3: https://tidd.ly/42l1Lwi
Topaz Photo AI: https://www.topazlabs.com/topaz-photo-ai/ref/901/?campaign=en
Do you want to get better bird pictures? Check out my new E-Book: https://naturfotografie-fopp.ch/wp/e-book-bird-photography/
Here are the sharpness comparisons in high quality:
https://www.dropbox.com/scl/fo/g8l1sleau86a1zcq6flrf/h?rlkey=vutdqt6h1ykz69bchoec3bipt&dl=0