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What would be the benefit of using this compared to something like Sumatra?

I used to use sumatra myself, in fact before I started developing sioyek, I tried to add some of the features to sumatra here: https://github.com/sumatrapdfreader/sumatrapdf/pull/869 .

Anyway, I don't think sumatra has these features:

* Marks

* Preview links

* Jump to figures if the PDF doesn't have links

* Portals

* Searchable highlights

And some other features which are shown in the video and github page. Also sioyek is available on linux and macos.