Sony fe 400 800mm f 6 3 8 g oss vs sony 200 600mm f 5 6 6 3?

Here is what the site says about that.

From Sony FE 400-800mm f/6.3-8 G OSS: Sony FE 400-800mm f/6.3-8 G OSS: A zoom lens by Sony for Full frame cameras, 400-800mm f/6.3-8. Sony's longest zoom, for birds and distant wildlife. Specs - Maker: Sony - Focal length: 400-800mm (zoom) - Maximum aperture: f/6.3-8 (it gets darker as you zoom in) - Made for: Full frame sensors - Mounts: Sony E - Stabilised: yes - Autofocus: yes What it frames like - On full frame (Sony E): as marked, 400-800mm. - On ...

From Sony FE 200-600mm f/5.6-6.3 G OSS: Sony FE 200-600mm f/5.6-6.3 G OSS: A zoom lens by Sony for Full frame cameras, 200-600mm f/5.6-6.3. The usual bird lens on Sony: long, internally zooming, and fair value.

Quoted from this site's pages.