Full-Frame Sony FE 70-300mm F4.5-5.6 G OSS Lens

[HarleyG]

I'm seeking advice on lenses, i.e. relating to a Sony telephoto to go with my 24-70 2.8 GMii.
I can’t decide whether to go for the Sony FE 70-300mm F4.5-5.6 G OSS Lens or the 70-200 Gmii.
Appreciate there's a huge price difference but my question is really about performance/usability - so the 300mm has the edge.
But then again, if I bolt on a teleconverter I could push the 200 up to 400 - and using APS-C push it even further.
Can’t help but notice there don't appear to be any threads for the 70-300 so wonder if it's not that popular?
Help!

 

[Unframed Dave]

I have no experience of the 70 to 300, the other is a monster of a lens.

I would be guided by your intended use more than anything.

Pushing lenses by using apsc mode is fine, but you do lose cropability as you are massively reducing your pixel count.