The choices for long telephoto f-mount zooms are the Nikon 200-500mm f/5.6, Tamron 150-600mm f/5-6.3 G1 or G2, Sigma 150-600mm f/5-6.3 Contemporary or Sport, Sigma 60-600mm f/4.5-6.3. The reviews for all these lenses are endless. Many have turned in their zooms for the Nikon 500mm f/5.6 pf because of superior prime IQ and it is smaller and lighter than the zooms. I often use the 200-500mm f/5.6 handheld for BIF. Yes it's heavy, but manageable. I have both the Tamron G2 and Nikon 200-500mm f/5.6, which I have used on both the D850, D500 and Z9. On the D850 and D500 the Nikon 200-500mm AF is more accurate, locks faster and doesn't hunt as much as the AF on the G2. While they are equally sharp in the middle, the G2 gets softer faster towards the corners than the Nikon. If you are shooting with a DX camera, it's not as much of an issue. You can use a 1.4x tele with the Nikon, which takes it to f/8, the upper limit for AF with both the D850 and D500, but AF is slower. I don't recommend a tele for the G2 as it's beyond f/8 and you are in manual focus territory.

You didn't mention the camera you will be using, but if it's a Z body with the FTZ II adapter, then the G2 AF is actually faster, more accurate, and doesn't hunt like it does on the dslrs. Until the announced Nikon Z 200-600mm f/6.3 is available, I'm using a Sony 200-600mm f/5.6-6.3 with a Megadap 211 E mount to Z mount adapter, which is working out very well for me.

You should join us here in the 21st century instead of sitting back there in the dark ages. Yes historically primes have been sharper than zooms. Yes maybe the 500 PF is incrementally sharper than the 200-500, but also less flexible. The zooms of today with computer aided design can be very sharp and require extreme pixel peeping to see a difference. The fact is many pros shoot zooms and many awards have been won by photographers shooting zooms. I also don’t get your supposition that zooms are adequate for landscapes but not nature. Why would I want landscapes any less sharp and I would conjecture that primes are used more often for landscapes than nature, and if you’re looking at a 200-500 zoom I’m pretty sure not many landscapes are being shot with it.