600mm f/4 or 400mm f/2.8? Lens buying thoughts from a wildlife photographer

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Here are direct links to the two lenses in the video:
Sony 400mm f/2.8 https://alnk.to/dAgkwab
Nikon 600mm f/4 https://alnk.to/eZAoIUP or https://amzn.to/2Ks4LxI

Видео 600mm f/4 or 400mm f/2.8? Lens buying thoughts from a wildlife photographer канала Steve Mattheis